diff --git a/libs/community/langchain_community/vectorstores/chroma.py b/libs/community/langchain_community/vectorstores/chroma.py
index 3bcb389cff5..7723285fafa 100644
--- a/libs/community/langchain_community/vectorstores/chroma.py
+++ b/libs/community/langchain_community/vectorstores/chroma.py
@@ -795,3 +795,7 @@ class Chroma(VectorStore):
             ids: List of ids to delete.
         """
         self._collection.delete(ids=ids)
+
+    def __len__(self) -> int:
+        """Count the number of documents in the collection."""
+        return self._collection.count()
diff --git a/libs/community/tests/integration_tests/vectorstores/test_chroma.py b/libs/community/tests/integration_tests/vectorstores/test_chroma.py
index 58e9bcf454e..0a0cf529d08 100644
--- a/libs/community/tests/integration_tests/vectorstores/test_chroma.py
+++ b/libs/community/tests/integration_tests/vectorstores/test_chroma.py
@@ -21,6 +21,7 @@ def test_chroma() -> None:
     )
     output = docsearch.similarity_search("foo", k=1)
     assert output == [Document(page_content="foo")]
+    assert len(docsearch) == 3
 
 
 async def test_chroma_async() -> None: