diff --git a/backend/app/Http/Controllers/Api/TransactionController.php b/backend/app/Http/Controllers/Api/TransactionController.php
index 39a3bcf..59671ea 100755
--- a/backend/app/Http/Controllers/Api/TransactionController.php
+++ b/backend/app/Http/Controllers/Api/TransactionController.php
@@ -25,7 +25,11 @@ public function index(Request $request): JsonResponse
         }
 
         if ($request->has('category_id')) {
-            $query->ofCategory($request->category_id);
+            if ($request->category_id === 'uncategorized') {
+                $query->whereNull('category_id');
+            } else {
+                $query->ofCategory($request->category_id);
+            }
         }
 
         if ($request->has('cost_center_id')) {
@@ -409,7 +413,11 @@ public function byWeek(Request $request): JsonResponse
         }
 
         if ($request->has('category_id')) {
-            $query->ofCategory($request->category_id);
+            if ($request->category_id === 'uncategorized') {
+                $query->whereNull('category_id');
+            } else {
+                $query->ofCategory($request->category_id);
+            }
         }
 
         if ($request->has('cost_center_id')) {
diff --git a/frontend/package-lock.json b/frontend/package-lock.json
index 1dfa57b..24fad39 100755
--- a/frontend/package-lock.json
+++ b/frontend/package-lock.json
@@ -61,7 +61,6 @@
       "resolved": "https://registry.npmjs.org/@babel/core/-/core-7.28.5.tgz",
       "integrity": "sha512-e7jT4DxYvIDLk1ZHmU/m/mB19rex9sv0c2ftBtjSBv+kVM/902eh0fINUzD7UwLLNR+jU585GxUJ8/EBfAM5fw==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@babel/code-frame": "^7.27.1",
         "@babel/generator": "^7.28.5",
@@ -918,7 +917,6 @@
       "resolved": "https://registry.npmjs.org/@types/react/-/react-19.2.7.tgz",
       "integrity": "sha512-MWtvHrGZLFttgeEj28VXHxpmwYbor/ATPYbBfSFZEIRK0ecCFLl2Qo55z52Hss+UV9CRN7trSeq1zbgx7YDWWg==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "csstype": "^3.2.2"
       }
@@ -957,7 +955,6 @@
       "resolved": "https://registry.npmjs.org/acorn/-/acorn-8.15.0.tgz",
       "integrity": "sha512-NZyJarBfL7nWwIq+FDL6Zp/yHEhePMNnnJ0y3qfieCrmNvYct8uvtiV41UvlSe6apAfk0fY1FbWx+NwfmpvtTg==",
       "dev": true,
-      "peer": true,
       "bin": {
         "acorn": "bin/acorn"
       },
@@ -1111,7 +1108,6 @@
           "url": "https://github.com/sponsors/ai"
         }
       ],
-      "peer": true,
       "dependencies": {
         "baseline-browser-mapping": "^2.9.0",
         "caniuse-lite": "^1.0.30001759",
@@ -1187,7 +1183,6 @@
       "version": "4.5.1",
       "resolved": "https://registry.npmjs.org/chart.js/-/chart.js-4.5.1.tgz",
       "integrity": "sha512-GIjfiT9dbmHRiYi6Nl2yFCq7kkwdkp1W/lp2J99rX0yo9tgJGn3lKQATztIjb5tVtevcBtIdICNWqlq5+E8/Pw==",
-      "peer": true,
       "dependencies": {
         "@kurkle/color": "^0.3.0"
       },
@@ -1394,7 +1389,6 @@
       "resolved": "https://registry.npmjs.org/eslint/-/eslint-9.39.1.tgz",
       "integrity": "sha512-BhHmn2yNOFA9H9JmmIVKJmd288g9hrVRDkdoIgRCRuSySRUHH7r/DI6aAXW9T1WwUuY3DFgrcaqB+deURBLR5g==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@eslint-community/eslint-utils": "^4.8.0",
         "@eslint-community/regexpp": "^4.12.1",
@@ -1878,7 +1872,6 @@
           "url": "https://www.i18next.com/how-to/faq#i18next-is-awesome.-how-can-i-support-the-project"
         }
       ],
-      "peer": true,
       "dependencies": {
         "@babel/runtime": "^7.28.4"
       },
@@ -2502,7 +2495,6 @@
       "resolved": "https://registry.npmjs.org/picomatch/-/picomatch-4.0.3.tgz",
       "integrity": "sha512-5gTmgEY/sqK6gFXLIsQNH19lWb4ebPDLA4SdLP7dsWkIXHWlG66oPuVvXSGFPppYZz8ZDZq0dYYrbHfBCVUb1Q==",
       "dev": true,
-      "peer": true,
       "engines": {
         "node": ">=12"
       },
@@ -2575,7 +2567,6 @@
       "version": "19.2.1",
       "resolved": "https://registry.npmjs.org/react/-/react-19.2.1.tgz",
       "integrity": "sha512-DGrYcCWK7tvYMnWh79yrPHt+vdx9tY+1gPZa7nJQtO/p8bLTDaHp4dzwEhQB7pZ4Xe3ok4XKuEPrVuc+wlpkmw==",
-      "peer": true,
       "engines": {
         "node": ">=0.10.0"
       }
@@ -2593,7 +2584,6 @@
       "version": "19.2.1",
       "resolved": "https://registry.npmjs.org/react-dom/-/react-dom-19.2.1.tgz",
       "integrity": "sha512-ibrK8llX2a4eOskq1mXKu/TGZj9qzomO+sNfO98M6d9zIPOEhlBkMkBUBLd1vgS0gQsLDBzA+8jJBVXDnfHmJg==",
-      "peer": true,
       "dependencies": {
         "scheduler": "^0.27.0"
       },
@@ -2899,7 +2889,6 @@
       "resolved": "https://registry.npmjs.org/rolldown-vite/-/rolldown-vite-7.2.5.tgz",
       "integrity": "sha512-u09tdk/huMiN8xwoiBbig197jKdCamQTtOruSalOzbqGje3jdHiV0njQlAW0YvzoahkirFePNQ4RYlfnRQpXZA==",
       "dev": true,
-      "peer": true,
       "dependencies": {
         "@oxc-project/runtime": "0.97.0",
         "fdir": "^6.5.0",
@@ -3025,7 +3014,6 @@
       "resolved": "https://registry.npmjs.org/zod/-/zod-4.1.13.tgz",
       "integrity": "sha512-AvvthqfqrAhNH9dnfmrfKzX5upOdjUVJYFqNSlkmGf64gRaTzlPwz99IHYnVs28qYAybvAlBV+H7pn0saFY4Ig==",
       "dev": true,
-      "peer": true,
       "funding": {
         "url": "https://github.com/sponsors/colinhacks"
       }
diff --git a/frontend/src/components/CategorySelector.jsx b/frontend/src/components/CategorySelector.jsx
index 9783aa8..7c5948f 100755
--- a/frontend/src/components/CategorySelector.jsx
+++ b/frontend/src/components/CategorySelector.jsx
@@ -18,7 +18,8 @@ export default function CategorySelector({
   onChange, 
   onAddNew,
   placeholder,
-  disabled = false 
+  disabled = false,
+  showUncategorized = false 
 }) {
   const { t } = useTranslation();
   const [isOpen, setIsOpen] = useState(false);
@@ -125,6 +126,7 @@ export default function CategorySelector({
 
   // Obtener nombre completo de la categoría seleccionada
   const getSelectedCategoryName = () => {
+    if (value === 'uncategorized') return t('transactions.uncategorized');
     const category = getCategoryById(value);
     if (!category) return placeholder || t('common.none');
     
@@ -262,6 +264,21 @@ export default function CategorySelector({
             <span className="text-muted">{t('common.none')}</span>
           </button>
 
+          {/* Opción "Sin categoría" para filtros */}
+          {showUncategorized && (
+            <>
+              <button
+                type="button"
+                className={`dropdown-item ${value === 'uncategorized' ? 'active' : ''}`}
+                onClick={(e) => handleSelect('uncategorized', e)}
+              >
+                <i className="bi bi-question-circle text-warning me-2"></i>
+                <span>{t('transactions.uncategorized')}</span>
+              </button>
+              <div className="dropdown-divider my-1"></div>
+            </>
+          )}
+
           <div className="dropdown-divider my-1"></div>
 
           {/* Lista de categorías */}
diff --git a/frontend/src/pages/TransactionsByWeek.jsx b/frontend/src/pages/TransactionsByWeek.jsx
index d4abc71..91851c2 100755
--- a/frontend/src/pages/TransactionsByWeek.jsx
+++ b/frontend/src/pages/TransactionsByWeek.jsx
@@ -1233,6 +1233,7 @@ export default function Transactions() {
                   value={filters.category_id}
                   onChange={handleFilterChange}
                   placeholder={t('common.all')}
+                  showUncategorized={true}
                 />
               </div>
               <div className="col-6 col-md-2">