diff --git a/libs/community/langchain_community/chat_models/azure_openai.py b/libs/community/langchain_community/chat_models/azure_openai.py
index 2f2711f4625..6825b3d85e2 100644
--- a/libs/community/langchain_community/chat_models/azure_openai.py
+++ b/libs/community/langchain_community/chat_models/azure_openai.py
@@ -209,7 +209,10 @@ class AzureChatOpenAI(ChatOpenAI):
                 "base_url": values["openai_api_base"],
                 "timeout": values["request_timeout"],
                 "max_retries": values["max_retries"],
-                "default_headers": values["default_headers"],
+                "default_headers": {
+                    **(values["default_headers"] or {}),
+                    "User-Agent": "langchain-comm-python-azure-openai",
+                },
                 "default_query": values["default_query"],
                 "http_client": values["http_client"],
             }
diff --git a/libs/community/langchain_community/embeddings/azure_openai.py b/libs/community/langchain_community/embeddings/azure_openai.py
index 61d1b4d4d3f..7687cb08ee3 100644
--- a/libs/community/langchain_community/embeddings/azure_openai.py
+++ b/libs/community/langchain_community/embeddings/azure_openai.py
@@ -163,7 +163,10 @@ class AzureOpenAIEmbeddings(OpenAIEmbeddings):  # type: ignore[override]
                 "base_url": self.openai_api_base,
                 "timeout": self.request_timeout,
                 "max_retries": self.max_retries,
-                "default_headers": self.default_headers,
+                "default_headers": {
+                    **(self.default_headers or {}),
+                    "User-Agent": "langchain-comm-python-azure-openai",
+                },
                 "default_query": self.default_query,
                 "http_client": self.http_client,
             }
diff --git a/libs/community/langchain_community/llms/openai.py b/libs/community/langchain_community/llms/openai.py
index 9a3937179c9..8504d532ad2 100644
--- a/libs/community/langchain_community/llms/openai.py
+++ b/libs/community/langchain_community/llms/openai.py
@@ -924,7 +924,10 @@ class AzureOpenAI(BaseOpenAI):
                 "base_url": values["openai_api_base"],
                 "timeout": values["request_timeout"],
                 "max_retries": values["max_retries"],
-                "default_headers": values["default_headers"],
+                "default_headers": {
+                    **(values["default_headers"] or {}),
+                    "User-Agent": "langchain-comm-python-azure-openai",
+                },
                 "default_query": values["default_query"],
                 "http_client": values["http_client"],
             }
diff --git a/libs/community/langchain_community/vectorstores/azuresearch.py b/libs/community/langchain_community/vectorstores/azuresearch.py
index 9b2d34fbd9a..4ed0d3f4d6d 100644
--- a/libs/community/langchain_community/vectorstores/azuresearch.py
+++ b/libs/community/langchain_community/vectorstores/azuresearch.py
@@ -94,7 +94,7 @@ def _get_search_client(
     scoring_profiles: Optional[List[ScoringProfile]] = None,
     default_scoring_profile: Optional[str] = None,
     default_fields: Optional[List[SearchField]] = None,
-    user_agent: Optional[str] = "langchain",
+    user_agent: Optional[str] = "langchain-comm-python-azure-search",
     cors_options: Optional[CorsOptions] = None,
     async_: bool = False,
     additional_search_client_options: Optional[Dict[str, Any]] = None,
diff --git a/libs/partners/openai/langchain_openai/chat_models/azure.py b/libs/partners/openai/langchain_openai/chat_models/azure.py
index c2cc41100b6..cb4bc88a382 100644
--- a/libs/partners/openai/langchain_openai/chat_models/azure.py
+++ b/libs/partners/openai/langchain_openai/chat_models/azure.py
@@ -643,7 +643,10 @@ class AzureChatOpenAI(BaseChatOpenAI):
             "organization": self.openai_organization,
             "base_url": self.openai_api_base,
             "timeout": self.request_timeout,
-            "default_headers": self.default_headers,
+            "default_headers": {
+                **(self.default_headers or {}),
+                "User-Agent": "langchain-partner-python-azure-openai",
+            },
             "default_query": self.default_query,
         }
         if self.max_retries is not None:
diff --git a/libs/partners/openai/langchain_openai/embeddings/azure.py b/libs/partners/openai/langchain_openai/embeddings/azure.py
index 3a83abc7d39..decc33e9639 100644
--- a/libs/partners/openai/langchain_openai/embeddings/azure.py
+++ b/libs/partners/openai/langchain_openai/embeddings/azure.py
@@ -198,7 +198,10 @@ class AzureOpenAIEmbeddings(OpenAIEmbeddings):  # type: ignore[override]
             "base_url": self.openai_api_base,
             "timeout": self.request_timeout,
             "max_retries": self.max_retries,
-            "default_headers": self.default_headers,
+            "default_headers": {
+                **(self.default_headers or {}),
+                "User-Agent": "langchain-partner-python-azure-openai",
+            },
             "default_query": self.default_query,
         }
         if not self.client:
diff --git a/libs/partners/openai/langchain_openai/llms/azure.py b/libs/partners/openai/langchain_openai/llms/azure.py
index 731b3e567f0..05e90d0b975 100644
--- a/libs/partners/openai/langchain_openai/llms/azure.py
+++ b/libs/partners/openai/langchain_openai/llms/azure.py
@@ -153,7 +153,10 @@ class AzureOpenAI(BaseOpenAI):
             "base_url": self.openai_api_base,
             "timeout": self.request_timeout,
             "max_retries": self.max_retries,
-            "default_headers": self.default_headers,
+            "default_headers": {
+                **(self.default_headers or {}),
+                "User-Agent": "langchain-partner-python-azure-openai",
+            },
             "default_query": self.default_query,
         }
         if not self.client: