diff --git a/llmstack/common/blocks/data/store/vectorstore/weaviate.py b/llmstack/common/blocks/data/store/vectorstore/weaviate.py
index 3f6860762db..e114db6d592 100644
--- a/llmstack/common/blocks/data/store/vectorstore/weaviate.py
+++ b/llmstack/common/blocks/data/store/vectorstore/weaviate.py
@@ -15,6 +15,7 @@
     DocumentQuery,
     VectorStoreInterface,
 )
+from llmstack.processors.providers.weaviate import with_integration_header
 
 logger = logging.getLogger(__name__)
 
@@ -136,7 +137,7 @@ def check_batch_result(
                             ),
                         )
 
-        headers = configuration.additional_headers
+        headers = with_integration_header(configuration.additional_headers)
         if configuration.openai_key is not None:
             headers["X-OpenAI-Api-Key"] = configuration.openai_key
         if configuration.cohere_api_key is not None:
diff --git a/llmstack/data/destinations/vector_stores/weaviate.py b/llmstack/data/destinations/vector_stores/weaviate.py
index 47ddf00e384..171c7a47fb8 100644
--- a/llmstack/data/destinations/vector_stores/weaviate.py
+++ b/llmstack/data/destinations/vector_stores/weaviate.py
@@ -28,6 +28,7 @@
     WeaviateCloudInstance,
     WeaviateLocalInstance,
     WeaviateProviderConfig,
+    with_integration_header,
 )
 
 logger = logging.getLogger(__name__)
@@ -124,6 +125,8 @@ def _create_weaviate_client(
     weaviate_config: Union[WeaviateLocalInstance, WeaviateCloudInstance], auth=None, additional_headers=None
 ):
     weaviate_client = None
+    # Passed at construction so the header reaches every REST request and the gRPC metadata.
+    additional_headers = with_integration_header(additional_headers)
     if isinstance(weaviate_config, WeaviateLocalInstance):
         weaviate_client = connect_to_custom(
             http_host=weaviate_config.http_host,
diff --git a/llmstack/processors/providers/weaviate/__init__.py b/llmstack/processors/providers/weaviate/__init__.py
index 9debc541630..29a96841f43 100644
--- a/llmstack/processors/providers/weaviate/__init__.py
+++ b/llmstack/processors/providers/weaviate/__init__.py
@@ -1,4 +1,5 @@
-from typing import Annotated, List, Optional, Union
+import importlib.metadata
+from typing import Annotated, Dict, List, Optional, Union
 
 from pydantic import BaseModel, Field
 
@@ -93,3 +94,27 @@ class WeaviateProviderConfig(ProviderConfig):
     @property
     def additional_headers_dict(self):
         return {header.key: header.value for header in self.additional_headers}
+
+
+# Weaviate (1.38+) reads this header as `{name}/{version}` to attribute requests to
+# the integration that sent them. Older servers ignore it.
+INTEGRATION_HEADER = "X-Weaviate-Client-Integration"
+
+
+def _integration_header_value() -> str:
+    try:
+        version = importlib.metadata.version("llmstack").strip() or "unknown"
+    except Exception:
+        version = "unknown"
+    return f"llmstack/{version}"
+
+
+def with_integration_header(headers: Optional[Dict[str, str]]) -> Dict[str, str]:
+    """Return a copy of `headers` with the X-Weaviate-Client-Integration header added.
+
+    A value already supplied by the user (any letter case) is kept as is.
+    """
+    headers = dict(headers or {})
+    if not any(key.lower() == INTEGRATION_HEADER.lower() for key in headers):
+        headers[INTEGRATION_HEADER] = _integration_header_value()
+    return headers