diff --git a/lightrag/api/routers/query_routes.py b/lightrag/api/routers/query_routes.py
index f0ee0e98..5fbf728f 100644
--- a/lightrag/api/routers/query_routes.py
+++ b/lightrag/api/routers/query_routes.py
@@ -103,6 +103,11 @@ class QueryRequest(BaseModel):
         description="If True, includes reference list in responses. Affects /query and /query/stream endpoints. /query/data always includes references.",
     )
 
+    file_path_filters: Optional[List[str]] = Field(
+        default=None,
+        description="Optional list of filename/path substrings; when provided, retrieval is restricted to matching sources.",
+    )
+
     stream: Optional[bool] = Field(
         default=True,
         description="If True, enables streaming output for real-time responses. Only affects /query/stream endpoint.",
diff --git a/lightrag/base.py b/lightrag/base.py
index 3cf40136..ad6d1164 100644
--- a/lightrag/base.py
+++ b/lightrag/base.py
@@ -130,6 +130,9 @@ class QueryParam:
     )
     """Maximum total tokens budget for the entire query context (entities + relations + chunks + system prompt)."""
 
+    file_path_filters: list[str] | None = None
+    """Optional filename/path substrings; when provided, retrieval limits results to matching sources."""
+
     hl_keywords: list[str] = field(default_factory=list)
     """List of high-level keywords to prioritize in retrieval."""
 
diff --git a/lightrag/operate.py b/lightrag/operate.py
index f94fb1ea..5a18918b 100644
--- a/lightrag/operate.py
+++ b/lightrag/operate.py
@@ -149,6 +149,118 @@ def chunking_by_token_size(
             )
     return results
 
+def _get_normalized_file_filters(query_param: QueryParam | None) -> list[str]:
+    """Prepare normalized (lower-cased) file path filters from the query parameters."""
+    if query_param is None:
+        return []
+
+    filters = getattr(query_param, "file_path_filters", None)
+    if not filters:
+        return []
+
+    normalized_filters: list[str] = []
+    for value in filters:
+        if isinstance(value, str):
+            trimmed = value.strip()
+            if trimmed:
+                normalized_filters.append(trimmed.lower())
+
+    # Remove duplicates while preserving order
+    seen = set()
+    deduped_filters: list[str] = []
+    for value in normalized_filters:
+        if value not in seen:
+            seen.add(value)
+            deduped_filters.append(value)
+    return deduped_filters
+
+
+def _split_file_path_values(file_path_value: Any) -> list[str]:
+    """Split stored file_path metadata into comparable parts."""
+    if not file_path_value or file_path_value == "unknown_source":
+        return []
+
+    paths: list[str] = []
+    # Support strings, lists, or other iterables
+    if isinstance(file_path_value, list):
+        iterable = file_path_value
+    else:
+        iterable = [file_path_value]
+
+    for item in iterable:
+        if item is None:
+            continue
+        item_str = str(item)
+        if not item_str:
+            continue
+        fragments = split_string_by_multi_markers(item_str, [GRAPH_FIELD_SEP])
+        for fragment in fragments:
+            fragment = fragment.strip()
+            if fragment:
+                paths.append(fragment)
+    return paths
+
+
+def _file_path_matches(file_path_value: Any, normalized_filters: list[str]) -> bool:
+    """Return True when the stored file path metadata matches any filter substring."""
+    if not normalized_filters:
+        return True
+
+    candidate_paths = _split_file_path_values(file_path_value)
+    if not candidate_paths:
+        return False
+
+    for candidate in candidate_paths:
+        lower_candidate = candidate.lower()
+        candidate_basename = Path(candidate).name.lower()
+        for filter_value in normalized_filters:
+            if filter_value in lower_candidate or filter_value in candidate_basename:
+                return True
+    return False
+
+
+def _filter_items_by_file_path(
+    items: list[dict],
+    normalized_filters: list[str],
+) -> list[dict]:
+    """Filter entity/relation dictionaries by file path metadata."""
+    if not normalized_filters:
+        return items
+
+    filtered: list[dict] = []
+    for item in items:
+        if _file_path_matches(item.get("file_path"), normalized_filters):
+            filtered.append(item)
+    return filtered
+
+
+def _filter_vector_chunks_by_file_path(
+    vector_chunks: list[dict],
+    normalized_filters: list[str],
+    chunk_tracking: dict | None = None,
+) -> list[dict]:
+    """Filter vector chunk results and prune chunk tracking accordingly."""
+    if not normalized_filters:
+        return vector_chunks
+
+    filtered_chunks: list[dict] = []
+    allowed_chunk_ids: set[str] = set()
+
+    for chunk in vector_chunks:
+        if _file_path_matches(chunk.get("file_path"), normalized_filters):
+            filtered_chunks.append(chunk)
+            chunk_id = chunk.get("chunk_id") or chunk.get("id")
+            if chunk_id:
+                allowed_chunk_ids.add(chunk_id)
+
+    if chunk_tracking is not None:
+        for chunk_id in list(chunk_tracking.keys()):
+            tracking_source = chunk_tracking[chunk_id].get("source")
+            if tracking_source == "C" and chunk_id not in allowed_chunk_ids:
+                del chunk_tracking[chunk_id]
+
+    return filtered_chunks
+
 
 async def _handle_entity_relation_summary(
     description_type: str,
@@ -3418,6 +3530,20 @@ async def _get_vector_context(
                 }
                 valid_chunks.append(chunk_with_metadata)
 
+        normalized_filters = _get_normalized_file_filters(query_param)
+        if normalized_filters:
+            original_len = len(valid_chunks)
+            valid_chunks = [
+                chunk
+                for chunk in valid_chunks
+                if _file_path_matches(chunk.get("file_path"), normalized_filters)
+            ]
+            logger.info(
+                "Vector chunk filter applied %s -> %d/%d",
+                query_param.file_path_filters,
+                len(valid_chunks),
+                original_len,
+            )
         logger.info(
             f"Naive query: {len(valid_chunks)} chunks (chunk_top_k:{search_top_k} cosine:{cosine_threshold})"
         )
@@ -3583,6 +3709,34 @@ async def _perform_kg_search(
             if rel_key not in seen_relations:
                 final_relations.append(relation)
                 seen_relations.add(rel_key)
+    
+    normalized_file_filters = _get_normalized_file_filters(query_param)
+    if normalized_file_filters:
+        original_counts = (
+            len(final_entities),
+            len(final_relations),
+            len(vector_chunks),
+        )
+        final_entities = _filter_items_by_file_path(
+            final_entities, normalized_file_filters
+        )
+        final_relations = _filter_items_by_file_path(
+            final_relations, normalized_file_filters
+        )
+        vector_chunks = _filter_vector_chunks_by_file_path(
+            vector_chunks, normalized_file_filters, chunk_tracking
+        )
+
+        logger.info(
+            "Applied file path filters %s -> entities %d/%d, relations %d/%d, vector chunks %d/%d",
+            query_param.file_path_filters,
+            len(final_entities),
+            original_counts[0],
+            len(final_relations),
+            original_counts[1],
+            len(vector_chunks),
+            original_counts[2],
+        )
 
     logger.info(
         f"Raw search results: {len(final_entities)} entities, {len(final_relations)} relations, {len(vector_chunks)} vector chunks"
@@ -3867,6 +4021,35 @@ async def _merge_all_chunks(
         f"Round-robin merged chunks: {origin_len} -> {len(merged_chunks)} (deduplicated {origin_len - len(merged_chunks)})"
     )
 
+    normalized_filters = _get_normalized_file_filters(query_param)
+    if normalized_filters:
+        original_len = len(merged_chunks)
+        merged_chunks = [
+            chunk
+            for chunk in merged_chunks
+            if _file_path_matches(chunk.get("file_path"), normalized_filters)
+        ]
+        if chunk_tracking is not None:
+            remaining_ids = {
+                chunk.get("chunk_id")
+                for chunk in merged_chunks
+                if chunk.get("chunk_id")
+            }
+            for chunk_id in list(chunk_tracking.keys()):
+                is_known_source = chunk_tracking[chunk_id].get("source") in {
+                    "C",
+                    "E",
+                    "R",
+                }
+                if is_known_source and chunk_id not in remaining_ids:
+                    del chunk_tracking[chunk_id]
+        logger.info(
+            "Merged chunks filtered by file paths %s -> %d/%d",
+            query_param.file_path_filters,
+            len(merged_chunks),
+            original_len,
+        )
+
     return merged_chunks
 
 
@@ -4308,10 +4491,16 @@ async def _find_related_text_unit_from_entities(
 
     if not node_datas:
         return []
+    
+    normalized_filters = _get_normalized_file_filters(query_param)
 
     # Step 1: Collect all text chunks for each entity
     entities_with_chunks = []
     for entity in node_datas:
+        if normalized_filters and not _file_path_matches(
+            entity.get("file_path"), normalized_filters
+        ):
+            continue
         if entity.get("source_id"):
             chunks = split_string_by_multi_markers(
                 entity["source_id"], [GRAPH_FIELD_SEP]
@@ -4434,6 +4623,10 @@ async def _find_related_text_unit_from_entities(
     result_chunks = []
     for i, (chunk_id, chunk_data) in enumerate(zip(unique_chunk_ids, chunk_data_list)):
         if chunk_data is not None and "content" in chunk_data:
+            if normalized_filters and not _file_path_matches(
+                chunk_data.get("file_path"), normalized_filters
+            ):
+                continue
             chunk_data_copy = chunk_data.copy()
             chunk_data_copy["source_type"] = "entity"
             chunk_data_copy["chunk_id"] = chunk_id  # Add chunk_id for deduplication
@@ -4560,10 +4753,16 @@ async def _find_related_text_unit_from_relations(
 
     if not edge_datas:
         return []
+    
+    normalized_filters = _get_normalized_file_filters(query_param)
 
     # Step 1: Collect all text chunks for each relationship
     relations_with_chunks = []
     for relation in edge_datas:
+        if normalized_filters and not _file_path_matches(
+            relation.get("file_path"), normalized_filters
+        ):
+            continue
         if relation.get("source_id"):
             chunks = split_string_by_multi_markers(
                 relation["source_id"], [GRAPH_FIELD_SEP]
@@ -4729,6 +4928,10 @@ async def _find_related_text_unit_from_relations(
     result_chunks = []
     for i, (chunk_id, chunk_data) in enumerate(zip(unique_chunk_ids, chunk_data_list)):
         if chunk_data is not None and "content" in chunk_data:
+            if normalized_filters and not _file_path_matches(
+                chunk_data.get("file_path"), normalized_filters
+            ):
+                continue
             chunk_data_copy = chunk_data.copy()
             chunk_data_copy["source_type"] = "relationship"
             chunk_data_copy["chunk_id"] = chunk_id  # Add chunk_id for deduplication
diff --git a/lightrag_webui/src/api/lightrag.ts b/lightrag_webui/src/api/lightrag.ts
index 7cf1aec6..0c7b8406 100644
--- a/lightrag_webui/src/api/lightrag.ts
+++ b/lightrag_webui/src/api/lightrag.ts
@@ -137,6 +137,8 @@ export type QueryRequest = {
   user_prompt?: string
   /** Enable reranking for retrieved text chunks. If True but no rerank model is configured, a warning will be issued. Default is True. */
   enable_rerank?: boolean
+  /** Optional list of filename/path substrings used to limit retrieval to matching sources. */
+  file_path_filters?: string[]
 }
 
 export type QueryResponse = {
diff --git a/lightrag_webui/src/components/retrieval/QuerySettings.tsx b/lightrag_webui/src/components/retrieval/QuerySettings.tsx
index 4ffebbb1..f6aef4c0 100644
--- a/lightrag_webui/src/components/retrieval/QuerySettings.tsx
+++ b/lightrag_webui/src/components/retrieval/QuerySettings.tsx
@@ -45,7 +45,8 @@ export default function QuerySettings() {
     chunk_top_k: 20,
     max_entity_tokens: 6000,
     max_relation_tokens: 8000,
-    max_total_tokens: 30000
+    max_total_tokens: 30000,
+    file_path_filters: [] as string[]
   }), [])
 
   const handleReset = useCallback((key: keyof typeof defaultValues) => {
@@ -73,6 +74,14 @@ export default function QuerySettings() {
     </TooltipProvider>
   )
 
+  const handleFilePathFiltersChange = useCallback((value: string) => {
+    const filters = value
+      .split(',')
+      .map((item) => item.trim())
+      .filter(Boolean)
+    handleChange('file_path_filters', filters)
+  }, [handleChange])
+
   return (
     <Card className="flex shrink-0 flex-col w-[280px]">
       <CardHeader className="px-4 pt-4 pb-2">
@@ -273,6 +282,36 @@ export default function QuerySettings() {
               </div>
             </>
 
+            {/* File Path Filters */}
+            <>
+              <TooltipProvider>
+                <Tooltip>
+                  <TooltipTrigger asChild>
+                    <label htmlFor="file_path_filters" className="ml-1 cursor-help">
+                      {t('retrievePanel.querySettings.filePathFilters')}
+                    </label>
+                  </TooltipTrigger>
+                  <TooltipContent side="left">
+                    <p>{t('retrievePanel.querySettings.filePathFiltersTooltip')}</p>
+                  </TooltipContent>
+                </Tooltip>
+              </TooltipProvider>
+              <div className="flex items-center gap-1">
+                <Input
+                  id="file_path_filters"
+                  type="text"
+                  value={(querySettings.file_path_filters ?? []).join(', ')}
+                  onChange={(e) => handleFilePathFiltersChange(e.target.value)}
+                  placeholder={t('retrievePanel.querySettings.filePathFiltersPlaceholder')}
+                  className="h-9 flex-1 pr-2"
+                />
+                <ResetButton
+                  onClick={() => handleReset('file_path_filters')}
+                  title="Clear filters"
+                />
+              </div>
+            </>
+
             {/* Max Entity Tokens */}
             <>
               <TooltipProvider>
diff --git a/lightrag_webui/src/locales/ar.json b/lightrag_webui/src/locales/ar.json
index 5c8561dc..c2f1a481 100644
--- a/lightrag_webui/src/locales/ar.json
+++ b/lightrag_webui/src/locales/ar.json
@@ -421,6 +421,9 @@
       "chunkTopK": "أعلى K للقطع",
       "chunkTopKTooltip": "عدد أجزاء النص المطلوب استردادها، وينطبق على جميع الأوضاع.",
       "chunkTopKPlaceholder": "أدخل قيمة chunk_top_k",
+      "filePathFilters": "مرشحات مسار الملف",
+      "filePathFiltersTooltip": "قم بتقييد الاسترجاع بالوثائق التي يحتوي مسار الملف المخزن على أي من السلاسل المحددة. افصل بين المرشحات باستخدام فواصل.",
+      "filePathFiltersPlaceholder": "مثال: reports/، meeting-notes.pdf",
       "maxEntityTokens": "الحد الأقصى لرموز الكيان",
       "maxEntityTokensTooltip": "الحد الأقصى لعدد الرموز المخصصة لسياق الكيان في نظام التحكم الموحد في الرموز",
       "maxRelationTokens": "الحد الأقصى لرموز العلاقة",
diff --git a/lightrag_webui/src/locales/en.json b/lightrag_webui/src/locales/en.json
index d3243e98..af35cb4d 100644
--- a/lightrag_webui/src/locales/en.json
+++ b/lightrag_webui/src/locales/en.json
@@ -421,6 +421,9 @@
       "chunkTopK": "Chunk Top K",
       "chunkTopKTooltip": "Number of text chunks to retrieve, applicable for all modes.",
       "chunkTopKPlaceholder": "Enter chunk_top_k value",
+      "filePathFilters": "File Path Filters",
+      "filePathFiltersTooltip": "Restrict retrieval to documents whose stored file path contains any of the specified substrings. Separate multiple filters with commas.",
+      "filePathFiltersPlaceholder": "e.g. reports/, meeting-notes.pdf",
       "maxEntityTokens": "Max Entity Tokens",
       "maxEntityTokensTooltip": "Maximum number of tokens allocated for entity context in unified token control system",
       "maxRelationTokens": "Max Relation Tokens",
diff --git a/lightrag_webui/src/locales/fr.json b/lightrag_webui/src/locales/fr.json
index 7913cb71..822393b7 100644
--- a/lightrag_webui/src/locales/fr.json
+++ b/lightrag_webui/src/locales/fr.json
@@ -421,6 +421,9 @@
       "chunkTopK": "Top K des Chunks",
       "chunkTopKTooltip": "Nombre de morceaux de texte à récupérer, applicable à tous les modes.",
       "chunkTopKPlaceholder": "Entrez la valeur chunk_top_k",
+      "filePathFilters": "Filtres de chemin de fichier",
+      "filePathFiltersTooltip": "Limiter la récupération aux documents dont le chemin de fichier enregistré contient l'une des sous-chaînes spécifiées. Séparez plusieurs filtres par des virgules.",
+      "filePathFiltersPlaceholder": "ex. reports/, meeting-notes.pdf",
       "maxEntityTokens": "Limite de jetons d'entité",
       "maxEntityTokensTooltip": "Nombre maximum de jetons alloués au contexte d'entité dans le système de contrôle de jetons unifié",
       "maxRelationTokens": "Limite de jetons de relation",
diff --git a/lightrag_webui/src/locales/zh.json b/lightrag_webui/src/locales/zh.json
index 0261e9ce..dfb2304d 100644
--- a/lightrag_webui/src/locales/zh.json
+++ b/lightrag_webui/src/locales/zh.json
@@ -421,6 +421,9 @@
       "chunkTopK": "文本块 Top K",
       "chunkTopKTooltip": "文本块检索数量, 适用于所有模式",
       "chunkTopKPlaceholder": "输入文本块chunk_top_k值",
+      "filePathFilters": "文件路径过滤",
+      "filePathFiltersTooltip": "仅检索文件路径包含任一指定子串的文档。多个过滤条件用逗号分隔。",
+      "filePathFiltersPlaceholder": "例如：reports/，meeting-notes.pdf",
       "maxEntityTokens": "实体令牌数上限",
       "maxEntityTokensTooltip": "统一令牌控制系统中分配给实体上下文的最大令牌数",
       "maxRelationTokens": "关系令牌数上限",
diff --git a/lightrag_webui/src/locales/zh_TW.json b/lightrag_webui/src/locales/zh_TW.json
index 0448e36a..946d0e2e 100644
--- a/lightrag_webui/src/locales/zh_TW.json
+++ b/lightrag_webui/src/locales/zh_TW.json
@@ -421,6 +421,9 @@
       "chunkTopK": "文本區塊 Top K",
       "chunkTopKTooltip": "文本區塊檢索數量，適用於所有模式。",
       "chunkTopKPlaceholder": "輸入文本區塊 chunk_top_k 值",
+      "filePathFilters": "檔案路徑篩選",
+      "filePathFiltersTooltip": "僅檢索儲存的檔案路徑包含任一指定子字串的文件。多個篩選條件請以逗號分隔。",
+      "filePathFiltersPlaceholder": "例如：reports/，meeting-notes.pdf",
       "historyTurns": "歷史輪次",
       "historyTurnsTooltip": "回應上下文中考慮的完整對話輪次（使用者-助手對）數量",
       "historyTurnsPlaceholder": "歷史輪次數",
diff --git a/lightrag_webui/src/stores/settings.ts b/lightrag_webui/src/stores/settings.ts
index 983f5c43..4c60be8f 100644
--- a/lightrag_webui/src/stores/settings.ts
+++ b/lightrag_webui/src/stores/settings.ts
@@ -134,7 +134,8 @@ const useSettingsStoreBase = create<SettingsState>()(
         stream: true,
         history_turns: 0,
         user_prompt: '',
-        enable_rerank: true
+        enable_rerank: true,
+        file_path_filters: []
       },
 
       setTheme: (theme: Theme) => set({ theme }),