diff --git a/API.md b/API.md
index cb550f6..5954173 100644
--- a/API.md
+++ b/API.md
@@ -75,9 +75,13 @@
   eliminarlas primero); limpia comentarios/adjuntos de la actividad de paso (no hay FK física
   cruzada). Arrastra `activity_dependencies` por `ON DELETE CASCADE`.
 - `POST /api/activities/:id/dependencies` · `DELETE /api/activities/:id/dependencies/:dependsOnId`
+- `PUT /api/projects/:projectId/activities/reorder` — `{ ids: [...] }` (orden manual, arrastrar
+  con el mouse); posiciones 1..N, nunca 0 (0 = "nunca reordenado a mano", ver `sort_order`).
 
 ### Tareas (`/api/activities/:activityId/tasks`)
 - `GET` · `POST` · `PUT /api/tasks/:id` · `PATCH /api/tasks/:id/done` · `DELETE /api/tasks/:id`
+- `PUT /api/activities/:activityId/tasks/reorder` — `{ ids: [...] }` (mismo mecanismo de orden
+  manual que las actividades).
 
 ### Tareas recurrentes (`/api/recurring-tasks`) — menú propio, independiente de Proyectos
 - `GET` · `POST` · `PUT /api/recurring-tasks/:id` · `DELETE /api/recurring-tasks/:id`
diff --git a/BASE_DE_DATOS.md b/BASE_DE_DATOS.md
index db33964..59d67ac 100644
--- a/BASE_DE_DATOS.md
+++ b/BASE_DE_DATOS.md
@@ -80,6 +80,10 @@
   proceso del backend (`setInterval` cada 15 min, sin cron del SO ni cola nueva).
 - `system_settings.value` para `smtp_pass_enc` va **cifrado** (AES-256-GCM, `ENCRYPTION_KEY` del
   `.env`) — nunca en texto plano, nunca se devuelve por la API (solo `configured: true/false`).
+- `activities.sort_order`/`tasks.sort_order`: orden manual (arrastrar con el mouse en la UI). `0` =
+  nunca reordenado a mano (la migración `012` lo inicializa con el `id` para preservar el orden
+  previo); el endpoint de reordenar siempre escribe posiciones `1..N`, nunca `0`, para que esa
+  migración siga siendo idempotente en deploys futuros sin pisar un orden real ya guardado.
 - Borrado lógico donde aplique (`users.is_active`); nunca DELETE físico de usuarios **activos** con
   historial (los `pending_approval` rechazados sí se borran, ver arriba).
 - `projects.deleted_at`/`deleted_by`: eliminación lógica (quien puede editar el proyecto puede
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d574e81..53acc85 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,13 @@
 # Changelog - project.linkedcorp.net
 
+## [1.14.0] - 2026-09-15
+### Added
+- Arrastrar con el mouse para reordenar: actividades (dentro de un proyecto) y tareas (dentro de
+  una actividad), ambas con el mismo mecanismo — un hook reutilizable (`useDragReorder`, drag &
+  drop nativo, sin librería nueva) usado tanto en `ListView` (opt-in vía `onReorder`, deshabilitado
+  mientras haya un ordenamiento por columna activo) como en el listado de tareas. Orden persistido
+  (`sort_order` en `activities`/`tasks`, migración `012`, posiciones 1..N).
+
 ## [1.13.0] - 2026-09-15
 ### Added
 - Eliminar actividad: `DELETE /api/activities/:id` (no existía) + botón "Eliminar" en el listado
diff --git a/VERSION b/VERSION
index feaae22..850e742 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-1.13.0
+1.14.0
diff --git a/backend/database/migrations/012_sort_order.sql b/backend/database/migrations/012_sort_order.sql
new file mode 100644
index 0000000..5fcf05c
--- /dev/null
+++ b/backend/database/migrations/012_sort_order.sql
@@ -0,0 +1,8 @@
+-- Orden manual (arrastrar con el mouse) para actividades y tareas. 0 = nunca reordenado a mano
+-- (se inicializa con el id para preservar el orden actual); el endpoint de reordenar SIEMPRE usa
+-- posiciones 1..N, nunca 0, para que este UPDATE de aqui abajo sea idempotente entre deploys.
+ALTER TABLE activities ADD COLUMN IF NOT EXISTS sort_order INT NOT NULL DEFAULT 0;
+ALTER TABLE tasks ADD COLUMN IF NOT EXISTS sort_order INT NOT NULL DEFAULT 0;
+
+UPDATE activities SET sort_order = id WHERE sort_order = 0;
+UPDATE tasks SET sort_order = id WHERE sort_order = 0;
diff --git a/backend/package.json b/backend/package.json
index eb35df3..96a71d6 100644
--- a/backend/package.json
+++ b/backend/package.json
@@ -1,6 +1,6 @@
 {
   "name": "project-linkedcorp-backend",
-  "version": "1.13.0",
+  "version": "1.14.0",
   "private": true,
   "type": "module",
   "main": "src/server.js",
diff --git a/backend/src/modules/activities/controller.js b/backend/src/modules/activities/controller.js
index 6e73305..ae961a3 100644
--- a/backend/src/modules/activities/controller.js
+++ b/backend/src/modules/activities/controller.js
@@ -9,6 +9,10 @@ export const postActivity = asyncHandler(async (req, res) => {
   ok(res, await service.createActivity(Number(req.params.projectId), req.body, req.currentUser), 201);
 });
 
+export const putReorderActivities = asyncHandler(async (req, res) => {
+  ok(res, await service.reorderActivities(Number(req.params.projectId), req.body.ids, req.currentUser));
+});
+
 export const getActivity = asyncHandler(async (req, res) => {
   ok(res, await service.getActivity(Number(req.params.id)));
 });
diff --git a/backend/src/modules/activities/repository.js b/backend/src/modules/activities/repository.js
index b1bb267..4a22520 100644
--- a/backend/src/modules/activities/repository.js
+++ b/backend/src/modules/activities/repository.js
@@ -5,7 +5,7 @@ const LIST_SELECT = `
          a.priority_id, pr.name AS priority_name, pr.color AS priority_color,
          a.status_id, st.name AS status_name, st.color AS status_color, st.is_closed AS status_is_closed,
          a.start_date, a.due_date, a.actual_end_date, a.progress_pct, a.is_milestone,
-         a.estimated_hours, a.created_by, a.created_at, a.updated_at
+         a.estimated_hours, a.sort_order, a.created_by, a.created_at, a.updated_at
   FROM activities a
   JOIN priorities pr ON pr.id = a.priority_id
   JOIN activity_statuses st ON st.id = a.status_id
@@ -13,7 +13,7 @@ const LIST_SELECT = `
 `;
 
 export async function findByProject(projectId) {
-  const [rows] = await pool.query(`${LIST_SELECT} WHERE a.project_id = ? ORDER BY a.start_date, a.id`, [projectId]);
+  const [rows] = await pool.query(`${LIST_SELECT} WHERE a.project_id = ? ORDER BY a.sort_order, a.id`, [projectId]);
   return rows;
 }
 
@@ -64,6 +64,14 @@ export async function remove(id) {
   await pool.query('DELETE FROM activities WHERE id = ?', [id]);
 }
 
+// Posiciones SIEMPRE 1..N (nunca 0 — 0 queda reservado para "nunca reordenado a mano" en la
+// migracion). Solo reordena las filas de projectId que vengan en ids, ignora el resto.
+export async function reorder(projectId, ids) {
+  for (let i = 0; i < ids.length; i++) {
+    await pool.query('UPDATE activities SET sort_order = ? WHERE id = ? AND project_id = ?', [i + 1, ids[i], projectId]);
+  }
+}
+
 export async function countTasks(id) {
   const [rows] = await pool.query('SELECT COUNT(*) AS c FROM tasks WHERE activity_id = ?', [id]);
   return rows[0].c;
diff --git a/backend/src/modules/activities/service.js b/backend/src/modules/activities/service.js
index 3ddb3e3..6a46404 100644
--- a/backend/src/modules/activities/service.js
+++ b/backend/src/modules/activities/service.js
@@ -118,6 +118,17 @@ export async function removeActivity(id, currentUser) {
   await recalcProjectProgress(activity.project_id);
 }
 
+// Nuevo orden manual (arrastrar con el mouse): mismo permiso que crear actividades en el proyecto.
+export async function reorderActivities(projectId, ids, currentUser) {
+  const project = await getProjectOr404(projectId);
+  if (!(await canWriteProject(currentUser, project))) {
+    throw new HttpError(403, 'No tienes permisos sobre este proyecto');
+  }
+  if (!Array.isArray(ids) || ids.length === 0) throw new HttpError(400, 'Falta el orden de actividades');
+  await repo.reorder(projectId, ids);
+  return repo.findByProject(projectId);
+}
+
 export async function addDependency(activityId, dependsOnActivityId, currentUser) {
   if (activityId === dependsOnActivityId) throw new HttpError(400, 'Una actividad no puede depender de si misma');
   const activity = await repo.findById(activityId);
diff --git a/backend/src/modules/projects/routes.js b/backend/src/modules/projects/routes.js
index 0099873..1df4411 100644
--- a/backend/src/modules/projects/routes.js
+++ b/backend/src/modules/projects/routes.js
@@ -5,7 +5,7 @@ import {
   deleteProjectPermanent, postMember, putMemberRole, deleteMember,
 } from './controller.js';
 import { getGantt } from '../dashboard/controller.js';
-import { getActivitiesByProject, postActivity } from '../activities/controller.js';
+import { getActivitiesByProject, postActivity, putReorderActivities } from '../activities/controller.js';
 
 const router = Router();
 
@@ -23,5 +23,6 @@ router.put('/:id/members/:userId/role', putMemberRole);
 router.delete('/:id/members/:userId', deleteMember);
 router.get('/:projectId/activities', getActivitiesByProject);
 router.post('/:projectId/activities', postActivity);
+router.put('/:projectId/activities/reorder', putReorderActivities);
 
 export default router;
diff --git a/backend/src/modules/tasks/controller.js b/backend/src/modules/tasks/controller.js
index ae3a0e0..b3c0c5f 100644
--- a/backend/src/modules/tasks/controller.js
+++ b/backend/src/modules/tasks/controller.js
@@ -13,6 +13,10 @@ export const putTask = asyncHandler(async (req, res) => {
   ok(res, await service.updateTask(Number(req.params.id), req.body, req.currentUser));
 });
 
+export const putReorderTasks = asyncHandler(async (req, res) => {
+  ok(res, await service.reorderTasks(Number(req.params.activityId), req.body.ids, req.currentUser));
+});
+
 export const patchTaskDone = asyncHandler(async (req, res) => {
   ok(res, await service.setTaskDone(Number(req.params.id), !!req.body.isDone, req.currentUser));
 });
diff --git a/backend/src/modules/tasks/repository.js b/backend/src/modules/tasks/repository.js
index a067229..72a3e31 100644
--- a/backend/src/modules/tasks/repository.js
+++ b/backend/src/modules/tasks/repository.js
@@ -3,14 +3,22 @@ import { pool } from '../../config/db.js';
 export async function findByActivity(activityId) {
   const [rows] = await pool.query(
     `SELECT t.id, t.activity_id, t.name, t.responsible_user_id, u.name AS responsible_name,
-            t.is_done, t.due_date, t.created_at
+            t.is_done, t.due_date, t.sort_order, t.created_at
      FROM tasks t LEFT JOIN users u ON u.id = t.responsible_user_id
-     WHERE t.activity_id = ? ORDER BY t.created_at`,
+     WHERE t.activity_id = ? ORDER BY t.sort_order, t.created_at`,
     [activityId]
   );
   return rows;
 }
 
+// Posiciones SIEMPRE 1..N (nunca 0 — ver migracion 012). Solo reordena las tareas de activityId
+// que vengan en ids, ignora el resto.
+export async function reorder(activityId, ids) {
+  for (let i = 0; i < ids.length; i++) {
+    await pool.query('UPDATE tasks SET sort_order = ? WHERE id = ? AND activity_id = ?', [i + 1, ids[i], activityId]);
+  }
+}
+
 export async function findById(id) {
   const [rows] = await pool.query('SELECT * FROM tasks WHERE id = ?', [id]);
   return rows[0] || null;
diff --git a/backend/src/modules/tasks/routes.js b/backend/src/modules/tasks/routes.js
index c33df7e..5a4c768 100644
--- a/backend/src/modules/tasks/routes.js
+++ b/backend/src/modules/tasks/routes.js
@@ -1,12 +1,13 @@
 import { Router } from 'express';
 import { requireAuth } from '../../middleware/auth.js';
-import { getTasks, postTask, putTask, patchTaskDone, deleteTask } from './controller.js';
+import { getTasks, postTask, putTask, putReorderTasks, patchTaskDone, deleteTask } from './controller.js';
 
 const router = Router();
 
 router.use(requireAuth);
 router.get('/activities/:activityId/tasks', getTasks);
 router.post('/activities/:activityId/tasks', postTask);
+router.put('/activities/:activityId/tasks/reorder', putReorderTasks);
 router.put('/tasks/:id', putTask);
 router.patch('/tasks/:id/done', patchTaskDone);
 router.delete('/tasks/:id', deleteTask);
diff --git a/backend/src/modules/tasks/service.js b/backend/src/modules/tasks/service.js
index 1dc8b60..7c21644 100644
--- a/backend/src/modules/tasks/service.js
+++ b/backend/src/modules/tasks/service.js
@@ -48,6 +48,14 @@ export async function setTaskDone(id, isDone, currentUser) {
   return updated;
 }
 
+// Nuevo orden manual (arrastrar con el mouse): mismo permiso que crear/editar tareas de la actividad.
+export async function reorderTasks(activityId, ids, currentUser) {
+  await requireActivityAccess(activityId, currentUser);
+  if (!Array.isArray(ids) || ids.length === 0) throw new HttpError(400, 'Falta el orden de tareas');
+  await repo.reorder(activityId, ids);
+  return repo.findByActivity(activityId);
+}
+
 export async function removeTask(id, currentUser) {
   const task = await repo.findById(id);
   if (!task) throw new HttpError(404, 'Tarea no encontrada');
diff --git a/frontend/package.json b/frontend/package.json
index 8182d80..67bf70f 100644
--- a/frontend/package.json
+++ b/frontend/package.json
@@ -1,7 +1,7 @@
 {
   "name": "project-linkedcorp-frontend",
   "private": true,
-  "version": "1.13.0",
+  "version": "1.14.0",
   "type": "module",
   "scripts": {
     "dev": "vite",
diff --git a/frontend/src/components/ListView.jsx b/frontend/src/components/ListView.jsx
index 5c00a30..c47a296 100644
--- a/frontend/src/components/ListView.jsx
+++ b/frontend/src/components/ListView.jsx
@@ -1,11 +1,15 @@
 import { useMemo, useState } from 'react';
-import { MoreVertical } from 'lucide-react';
+import { MoreVertical, GripVertical } from 'lucide-react';
 import { useUi } from '../context/ui-context.jsx';
+import { useDragReorder } from '../hooks/useDragReorder.js';
 import { Flyout, FlyoutItem } from './Flyout.jsx';
 
 // ListView/DataGrid: columnas ordenables, buscador ligero sobre el haystack completo, clic en
 // fila abre detalle, boton "..." abre el menu de acciones (equivalente al clic derecho).
-export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowClick, rowActions, getRowKey, initialSort }) {
+// `onReorder(idsEnNuevoOrden)` es opcional: si se pasa, habilita arrastrar filas con el mouse para
+// definir un orden manual (columna con icono de agarre a la izquierda) — solo mientras no haya un
+// ordenamiento por columna activo, para no mezclar los dos mecanismos de orden a la vez.
+export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowClick, rowActions, getRowKey, initialSort, onReorder }) {
   const { t } = useUi();
   const [sort, setSort] = useState(initialSort || { key: null, dir: 1 });
 
@@ -26,6 +30,10 @@ export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowC
     });
   }, [filtered, sort, columns]);
 
+  const dragEnabled = !!onReorder && !sort.key && !searchValue;
+  const { order, getDragHandlers, isDragging } = useDragReorder(sorted, (ids) => onReorder?.(ids), getRowKey);
+  const displayRows = dragEnabled ? order : sorted;
+
   function toggleSort(key) {
     setSort((prev) => (prev.key === key ? { key, dir: prev.dir * -1 } : { key, dir: 1 }));
   }
@@ -35,6 +43,7 @@ export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowC
       <table className="list-table">
         <thead>
           <tr>
+            {dragEnabled && <th style={{ width: 28 }} />}
             {columns.map((col) => (
               <th key={col.key} onClick={() => col.sortable !== false && toggleSort(col.key)}>
                 {col.label}{sort.key === col.key ? (sort.dir === 1 ? ' ▲' : ' ▼') : ''}
@@ -44,8 +53,18 @@ export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowC
           </tr>
         </thead>
         <tbody>
-          {sorted.map((row) => (
-            <tr key={getRowKey(row)} onClick={() => onRowClick?.(row)}>
+          {displayRows.map((row) => (
+            <tr
+              key={getRowKey(row)}
+              onClick={() => onRowClick?.(row)}
+              className={dragEnabled && isDragging(getRowKey(row)) ? 'dragging' : ''}
+              {...(dragEnabled ? getDragHandlers(row) : {})}
+            >
+              {dragEnabled && (
+                <td className="drag-handle-cell" onClick={(e) => e.stopPropagation()}>
+                  <GripVertical size={15} />
+                </td>
+              )}
               {columns.map((col) => (
                 <td key={col.key}>{col.render ? col.render(row) : row[col.key]}</td>
               ))}
@@ -66,7 +85,7 @@ export function ListView({ columns, rows, searchValue, getSearchHaystack, onRowC
           ))}
         </tbody>
       </table>
-      {sorted.length === 0 && <div className="list-empty">{t('common_empty')}</div>}
+      {displayRows.length === 0 && <div className="list-empty">{t('common_empty')}</div>}
     </div>
   );
 }
diff --git a/frontend/src/hooks/useDragReorder.js b/frontend/src/hooks/useDragReorder.js
new file mode 100644
index 0000000..aa7f7bf
--- /dev/null
+++ b/frontend/src/hooks/useDragReorder.js
@@ -0,0 +1,51 @@
+import { useEffect, useRef, useState } from 'react';
+
+// Arrastrar-para-reordenar generico con drag & drop nativo (sin libreria nueva). `items` debe
+// tener `.id`; `onReorder(idsEnNuevoOrden)` se llama al soltar. La reubicacion se ve al instante
+// mientras se arrastra (estado local optimista); el llamador persiste el orden final.
+// Reutilizado por ListView (actividades, y cualquier listado que pase onReorder) y por el listado
+// de tareas de una actividad.
+export function useDragReorder(items, onReorder, getId = (x) => x.id) {
+  const [order, setOrder] = useState(items);
+  const orderRef = useRef(items);
+  const draggingId = useRef(null);
+
+  // Se sincroniza por el CONTENIDO (ids), no por la referencia del arreglo: un llamador que pase
+  // `algo || []` (comun) crea un arreglo nuevo en cada render aunque el contenido no cambie, y
+  // sincronizar por referencia ahi entra en loop infinito de renders.
+  const itemsKey = items.map(getId).join(',');
+  useEffect(() => {
+    if (!draggingId.current) { setOrder(items); orderRef.current = items; }
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [itemsKey]);
+
+  useEffect(() => { orderRef.current = order; }, [order]);
+
+  function getDragHandlers(item) {
+    const itemId = getId(item);
+    return {
+      draggable: true,
+      onDragStart: (e) => { draggingId.current = itemId; e.dataTransfer.effectAllowed = 'move'; },
+      onDragOver: (e) => {
+        e.preventDefault();
+        if (draggingId.current === null || draggingId.current === itemId) return;
+        setOrder((current) => {
+          const from = current.findIndex((x) => getId(x) === draggingId.current);
+          const to = current.findIndex((x) => getId(x) === itemId);
+          if (from === -1 || to === -1 || from === to) return current;
+          const next = current.slice();
+          const [moved] = next.splice(from, 1);
+          next.splice(to, 0, moved);
+          return next;
+        });
+      },
+      onDrop: (e) => e.preventDefault(),
+      onDragEnd: () => {
+        draggingId.current = null;
+        onReorder(orderRef.current.map(getId));
+      },
+    };
+  }
+
+  return { order, getDragHandlers, isDragging: (itemId) => draggingId.current === itemId };
+}
diff --git a/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx b/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx
index eb174f4..0f73ac2 100644
--- a/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx
+++ b/frontend/src/pages/Proyectos/ActivityDetailPanel.jsx
@@ -1,9 +1,10 @@
 import { useEffect, useState } from 'react';
-import { Pencil, Save, X, Plus, Trash2, Link2, Repeat } from 'lucide-react';
+import { Pencil, Save, X, Plus, Trash2, Link2, Repeat, GripVertical } from 'lucide-react';
 import { useUi } from '../../context/ui-context.jsx';
 import { useAsync, useAction } from '../../hooks/useAsync.js';
+import { useDragReorder } from '../../hooks/useDragReorder.js';
 import { updateActivity, addDependency, removeDependency } from '../../services/activities.js';
-import { listTasks, createTask, updateTask, setTaskDone, deleteTask } from '../../services/tasks.js';
+import { listTasks, createTask, updateTask, setTaskDone, deleteTask, reorderTasks } from '../../services/tasks.js';
 import { promoteTaskToRecurring } from '../../services/recurringTasks.js';
 import { listCatalog } from '../../services/catalogs.js';
 import { listUsers } from '../../services/users.js';
@@ -34,6 +35,10 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
   const { data: statuses } = useAsync(() => listCatalog('activity-statuses'), []);
   const { data: users } = useAsync(listUsers, []);
   const { data: tasks, reload: reloadTasks } = useAsync(() => listTasks(activity.id), [activity.id]);
+  const { order: orderedTasks, getDragHandlers, isDragging } = useDragReorder(tasks || [], async (ids) => {
+    await reorderTasks(activity.id, ids);
+    await reloadTasks();
+  });
 
   const [tab, setTab] = useState('detail');
   const [editing, setEditing] = useState(false);
@@ -228,8 +233,13 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
 
       {tab === 'tasks' && (
         <div>
-          {(tasks || []).map((task) => (
-            <div key={task.id} style={{ display: 'flex', alignItems: 'center', gap: 8, padding: '5px 0' }}>
+          {orderedTasks.map((task) => (
+            <div
+              key={task.id}
+              className={isDragging(task.id) ? 'drag-row dragging' : 'drag-row'}
+              style={{ display: 'flex', alignItems: 'center', gap: 8, padding: '5px 0' }}
+              {...(editingTaskId === task.id ? {} : getDragHandlers(task))}
+            >
               {editingTaskId === task.id ? (
                 <>
                   <input
@@ -242,6 +252,7 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
                 </>
               ) : (
                 <>
+                  <GripVertical size={15} className="drag-handle" style={{ opacity: .6, cursor: 'grab', flexShrink: 0 }} />
                   <input type="checkbox" checked={!!task.is_done} onChange={() => toggleTask(task)} />
                   <span style={{ flex: 1, fontSize: '.8rem', textDecoration: task.is_done ? 'line-through' : 'none', opacity: task.is_done ? .6 : 1 }}>{task.name}</span>
                   <button className="icon-btn" title={t('common_edit')} onClick={() => startEditTask(task)}><Pencil size={15} /></button>
@@ -251,7 +262,7 @@ export default function ActivityDetailPanel({ activity, projectId, siblingActivi
               )}
             </div>
           ))}
-          {(!tasks || tasks.length === 0) && <div className="text-muted" style={{ fontSize: '.78rem' }}>{t('common_empty')}</div>}
+          {orderedTasks.length === 0 && <div className="text-muted" style={{ fontSize: '.78rem' }}>{t('common_empty')}</div>}
           <div style={{ display: 'flex', gap: 8, marginTop: 8 }}>
             <input className="input" value={newTask} placeholder={t('task_new')} onChange={(e) => setNewTask(e.target.value)} onKeyDown={(e) => e.key === 'Enter' && addTaskItem()} />
             <Button variant="standard" icon={Plus} onClick={addTaskItem}>{t('common_new')}</Button>
diff --git a/frontend/src/pages/Proyectos/ProjectActivitiesTab.jsx b/frontend/src/pages/Proyectos/ProjectActivitiesTab.jsx
index 23a74cf..a7d0df9 100644
--- a/frontend/src/pages/Proyectos/ProjectActivitiesTab.jsx
+++ b/frontend/src/pages/Proyectos/ProjectActivitiesTab.jsx
@@ -3,7 +3,7 @@ import { Plus, Save, Trash2 } from 'lucide-react';
 import { useUi } from '../../context/ui-context.jsx';
 import { useAuth } from '../../context/auth-context.jsx';
 import { useAsync, useAction } from '../../hooks/useAsync.js';
-import { listActivitiesByProject, createActivity, getActivity, deleteActivity } from '../../services/activities.js';
+import { listActivitiesByProject, createActivity, getActivity, deleteActivity, reorderActivities } from '../../services/activities.js';
 import { listCatalog } from '../../services/catalogs.js';
 import { listUsers } from '../../services/users.js';
 import { ListView } from '../../components/ListView.jsx';
@@ -57,6 +57,11 @@ export default function ProjectActivitiesTab({ projectId }) {
     if (selected) setSelected(await getActivity(selected.id));
   }
 
+  async function handleReorder(ids) {
+    await reorderActivities(projectId, ids);
+    await reload();
+  }
+
   function confirmDelete(row) {
     openDialog({
       tone: 'warning',
@@ -107,6 +112,7 @@ export default function ProjectActivitiesTab({ projectId }) {
         getSearchHaystack={(a) => `${a.code} ${a.name} ${a.responsible_name || ''}`}
         getRowKey={(a) => a.id}
         onRowClick={openActivity}
+        onReorder={currentUser?.roleCode !== 'viewer' ? handleReorder : undefined}
         rowActions={currentUser?.roleCode !== 'viewer' ? (a) => [
           { label: t('common_delete'), icon: Trash2, danger: true, onClick: () => confirmDelete(a) },
         ] : undefined}
diff --git a/frontend/src/services/activities.js b/frontend/src/services/activities.js
index f658116..7cc2467 100644
--- a/frontend/src/services/activities.js
+++ b/frontend/src/services/activities.js
@@ -5,5 +5,6 @@ export const createActivity = (projectId, data) => api.post(`/projects/${project
 export const getActivity = (id) => api.get(`/activities/${id}`);
 export const updateActivity = (id, data) => api.put(`/activities/${id}`, data);
 export const deleteActivity = (id) => api.delete(`/activities/${id}`);
+export const reorderActivities = (projectId, ids) => api.put(`/projects/${projectId}/activities/reorder`, { ids });
 export const addDependency = (id, dependsOnActivityId) => api.post(`/activities/${id}/dependencies`, { dependsOnActivityId });
 export const removeDependency = (id, dependsOnId) => api.delete(`/activities/${id}/dependencies/${dependsOnId}`);
diff --git a/frontend/src/services/tasks.js b/frontend/src/services/tasks.js
index 8984aba..6ad0506 100644
--- a/frontend/src/services/tasks.js
+++ b/frontend/src/services/tasks.js
@@ -5,3 +5,4 @@ export const createTask = (activityId, data) => api.post(`/activities/${activity
 export const updateTask = (id, data) => api.put(`/tasks/${id}`, data);
 export const setTaskDone = (id, isDone) => api.patch(`/tasks/${id}/done`, { isDone });
 export const deleteTask = (id) => api.delete(`/tasks/${id}`);
+export const reorderTasks = (activityId, ids) => api.put(`/activities/${activityId}/tasks/reorder`, { ids });
diff --git a/frontend/src/styles/app.css b/frontend/src/styles/app.css
index b10454b..fcd2f7f 100644
--- a/frontend/src/styles/app.css
+++ b/frontend/src/styles/app.css
@@ -155,6 +155,11 @@ table.list-table { width: 100%; border-collapse: collapse; font-size: .8rem; }
 .row-menu-btn { opacity: .6; }
 .row-menu-btn:hover { opacity: 1; }
 
+/* --- Arrastrar para reordenar (ListView con onReorder, listado de tareas de una actividad) --- */
+.drag-handle-cell { width: 28px; padding: 10px 4px !important; color: rgb(var(--muted)); cursor: grab; }
+.drag-handle-cell:active { cursor: grabbing; }
+.list-table tbody tr.dragging, .drag-row.dragging { opacity: .4; }
+
 /* --- Badges --- */
 .badge {
   display: inline-flex; align-items: center; gap: 6px; padding: 3px 9px; border-radius: 999px;