diff --git a/memos/crud.py b/memos/crud.py
index 7b3154f..67f0fb5 100644
--- a/memos/crud.py
+++ b/memos/crud.py
@@ -67,6 +67,15 @@ def get_entity_by_filepath(filepath: str, db: Session) -> Entity | None:
     return db.query(EntityModel).filter(EntityModel.filepath == filepath).first()
 
 
+def remove_entity(entity_id: int, db: Session):
+    entity = db.query(EntityModel).filter(EntityModel.id == entity_id).first()
+    if entity:
+        db.delete(entity)
+        db.commit()
+    else:
+        raise ValueError(f"Entity with id {entity_id} not found")
+
+
 def create_plugin(newPlugin: NewPluginParam, db: Session) -> Plugin:
     db_plugin = PluginModel(**newPlugin.model_dump(mode='json'))
     db.add(db_plugin)
diff --git a/memos/server.py b/memos/server.py
index 4457af2..b51f753 100644
--- a/memos/server.py
+++ b/memos/server.py
@@ -141,6 +141,15 @@ def update_entity(
     return entity
 
 
+@app.delete("/libraries/{library_id}/entities/{entity_id}", status_code=status.HTTP_204_NO_CONTENT)
+def remove_entity(library_id: int, entity_id: int, db: Session = Depends(get_db)):
+    entity = crud.get_entity_by_id(entity_id, db)
+    if entity is None or entity.library_id != library_id:
+        raise HTTPException(status_code=404, detail="Entity not found in the specified library")
+    
+    crud.remove_entity(entity_id, db)
+
+
 @app.post("/plugins", response_model=Plugin)
 def new_plugin(new_plugin: NewPluginParam, db: Session = Depends(get_db)):
     plugin = crud.create_plugin(new_plugin, db)
diff --git a/memos/test_server.py b/memos/test_server.py
index f30d242..b87a25c 100644
--- a/memos/test_server.py
+++ b/memos/test_server.py
@@ -314,3 +314,44 @@ def test_list_entities_in_folder(client):
     invalid_list_response = client.get(f"/libraries/9999/folders/{folder_id}/entities")
     assert invalid_list_response.status_code == 404
     assert invalid_list_response.json() == {"detail": "Library not found"}
+
+
+def test_remove_entity(client):
+    # Create a new library
+    new_library = NewLibraryParam(name="Test Library")
+    library_response = client.post("/libraries", json=new_library.model_dump(mode="json"))
+    library_id = library_response.json()["id"]
+
+    # Create a new folder in the library
+    new_folder = NewFolderParam(path="/tmp")
+    folder_response = client.post(f"/libraries/{library_id}/folders", json=new_folder.model_dump(mode="json"))
+    folder_id = folder_response.json()["id"]
+
+    # Create a new entity to be deleted
+    new_entity = NewEntityParam(
+        filename="test_delete.txt",
+        filepath="test_delete.txt",
+        size=100,
+        file_created_at="2023-01-01T00:00:00",
+        file_last_modified_at="2023-01-01T00:00:00",
+        file_type="text/plain",
+        folder_id=folder_id,
+    )
+    entity_response = client.post(
+        f"/libraries/{library_id}/entities", json=new_entity.model_dump(mode="json")
+    )
+    entity_id = entity_response.json()["id"]
+
+    # Delete the entity
+    delete_response = client.delete(f"/libraries/{library_id}/entities/{entity_id}")
+    assert delete_response.status_code == 204
+
+    # Verify the entity is deleted
+    get_response = client.get(f"/libraries/{library_id}/entities/{entity_id}")
+    assert get_response.status_code == 404
+    assert get_response.json() == {"detail": "Entity not found"}
+
+    # Test for entity not found in the specified library
+    invalid_delete_response = client.delete(f"/libraries/{library_id}/entities/9999")
+    assert invalid_delete_response.status_code == 404
+    assert invalid_delete_response.json() == {"detail": "Entity not found in the specified library"}