diff --git a/haystack/components/generators/azure.py b/haystack/components/generators/azure.py
index 0e20dc3c3..f0c5da7be 100644
--- a/haystack/components/generators/azure.py
+++ b/haystack/components/generators/azure.py
@@ -68,6 +68,7 @@ class AzureOpenAIGenerator(OpenAIGenerator):
         timeout: Optional[float] = None,
         max_retries: Optional[int] = None,
         generation_kwargs: Optional[Dict[str, Any]] = None,
+        default_headers: Optional[Dict[str, str]] = None,
     ):
         """
         Initialize the Azure OpenAI Generator.
@@ -107,6 +108,7 @@ class AzureOpenAIGenerator(OpenAIGenerator):
                 Higher values make the model less likely to repeat the token.
             - `logit_bias`: Adds a logit bias to specific tokens. The keys of the dictionary are tokens, and the
                 values are the bias to add to that token.
+        :param default_headers: Default headers to use for the AzureOpenAI client.
         """
         # We intentionally do not call super().__init__ here because we only need to instantiate the client to interact
         # with the API.
@@ -136,6 +138,7 @@ class AzureOpenAIGenerator(OpenAIGenerator):
         self.model: str = azure_deployment or "gpt-35-turbo"
         self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
         self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.default_headers = default_headers or {}
 
         self.client = AzureOpenAI(
             api_version=api_version,
@@ -146,6 +149,7 @@ class AzureOpenAIGenerator(OpenAIGenerator):
             organization=organization,
             timeout=self.timeout,
             max_retries=self.max_retries,
+            default_headers=self.default_headers,
         )
 
     def to_dict(self) -> Dict[str, Any]:
@@ -169,6 +173,7 @@ class AzureOpenAIGenerator(OpenAIGenerator):
             azure_ad_token=self.azure_ad_token.to_dict() if self.azure_ad_token is not None else None,
             timeout=self.timeout,
             max_retries=self.max_retries,
+            default_headers=self.default_headers,
         )
 
     @classmethod
diff --git a/haystack/components/generators/chat/azure.py b/haystack/components/generators/chat/azure.py
index 5fcf5ebf7..d8dc555cd 100644
--- a/haystack/components/generators/chat/azure.py
+++ b/haystack/components/generators/chat/azure.py
@@ -74,6 +74,7 @@ class AzureOpenAIChatGenerator(OpenAIChatGenerator):
         timeout: Optional[float] = None,
         max_retries: Optional[int] = None,
         generation_kwargs: Optional[Dict[str, Any]] = None,
+        default_headers: Optional[Dict[str, str]] = None,
     ):
         """
         Initialize the Azure OpenAI Chat Generator component.
@@ -110,6 +111,7 @@ class AzureOpenAIChatGenerator(OpenAIChatGenerator):
                 Higher values make the model less likely to repeat the token.
             - `logit_bias`: Adds a logit bias to specific tokens. The keys of the dictionary are tokens, and the
                 values are the bias to add to that token.
+        :param default_headers: Default headers to use for the AzureOpenAI client.
         """
         # We intentionally do not call super().__init__ here because we only need to instantiate the client to interact
         # with the API.
@@ -138,6 +140,7 @@ class AzureOpenAIChatGenerator(OpenAIChatGenerator):
         self.model = azure_deployment or "gpt-35-turbo"
         self.timeout = timeout or float(os.environ.get("OPENAI_TIMEOUT", 30.0))
         self.max_retries = max_retries or int(os.environ.get("OPENAI_MAX_RETRIES", 5))
+        self.default_headers = default_headers or {}
 
         self.client = AzureOpenAI(
             api_version=api_version,
@@ -148,6 +151,7 @@ class AzureOpenAIChatGenerator(OpenAIChatGenerator):
             organization=organization,
             timeout=self.timeout,
             max_retries=self.max_retries,
+            default_headers=self.default_headers,
         )
 
     def to_dict(self) -> Dict[str, Any]:
@@ -170,6 +174,7 @@ class AzureOpenAIChatGenerator(OpenAIChatGenerator):
             max_retries=self.max_retries,
             api_key=self.api_key.to_dict() if self.api_key is not None else None,
             azure_ad_token=self.azure_ad_token.to_dict() if self.azure_ad_token is not None else None,
+            default_headers=self.default_headers,
         )
 
     @classmethod
diff --git a/releasenotes/notes/add-azure-kwargs-6a5ab1358ef7f44c.yaml b/releasenotes/notes/add-azure-kwargs-6a5ab1358ef7f44c.yaml
new file mode 100644
index 000000000..19e3bb0b6
--- /dev/null
+++ b/releasenotes/notes/add-azure-kwargs-6a5ab1358ef7f44c.yaml
@@ -0,0 +1,6 @@
+---
+enhancements:
+  - |
+    Expose default_headers to pass custom headers to Azure API including APIM subscription key.
+  - |
+    Add optional azure_kwargs dictionary parameter to pass in parameters undefined in Haystack but supported by AzureOpenAI.
diff --git a/test/components/generators/chat/test_azure.py b/test/components/generators/chat/test_azure.py
index 80a290a65..0741c9849 100644
--- a/test/components/generators/chat/test_azure.py
+++ b/test/components/generators/chat/test_azure.py
@@ -57,6 +57,7 @@ class TestOpenAIChatGenerator:
                 "generation_kwargs": {},
                 "timeout": 30.0,
                 "max_retries": 5,
+                "default_headers": {},
             },
         }
 
@@ -84,6 +85,7 @@ class TestOpenAIChatGenerator:
                 "timeout": 2.5,
                 "max_retries": 10,
                 "generation_kwargs": {"max_tokens": 10, "some_test_param": "test-params"},
+                "default_headers": {},
             },
         }
 
@@ -98,7 +100,7 @@ class TestOpenAIChatGenerator:
 
     @pytest.mark.integration
     @pytest.mark.skipif(
-        not os.environ.get("AZURE_OPENAI_API_KEY", None) and not os.environ.get("AZURE_OPENAI_ENDPOINT", None),
+        not os.environ.get("AZURE_OPENAI_API_KEY", None) or not os.environ.get("AZURE_OPENAI_ENDPOINT", None),
         reason=(
             "Please export env variables called AZURE_OPENAI_API_KEY containing "
             "the Azure OpenAI key, AZURE_OPENAI_ENDPOINT containing "
diff --git a/test/components/generators/test_azure.py b/test/components/generators/test_azure.py
index b4638a167..bca22e214 100644
--- a/test/components/generators/test_azure.py
+++ b/test/components/generators/test_azure.py
@@ -60,6 +60,7 @@ class TestAzureOpenAIGenerator:
                 "timeout": 30.0,
                 "max_retries": 5,
                 "generation_kwargs": {},
+                "default_headers": {},
             },
         }
 
@@ -89,6 +90,7 @@ class TestAzureOpenAIGenerator:
                 "timeout": 3.5,
                 "max_retries": 10,
                 "generation_kwargs": {"max_tokens": 10, "some_test_param": "test-params"},
+                "default_headers": {},
             },
         }
 
@@ -103,7 +105,7 @@ class TestAzureOpenAIGenerator:
 
     @pytest.mark.integration
     @pytest.mark.skipif(
-        not os.environ.get("AZURE_OPENAI_API_KEY", None) and not os.environ.get("AZURE_OPENAI_ENDPOINT", None),
+        not os.environ.get("AZURE_OPENAI_API_KEY", None) or not os.environ.get("AZURE_OPENAI_ENDPOINT", None),
         reason=(
             "Please export env variables called AZURE_OPENAI_API_KEY containing "
             "the Azure OpenAI key, AZURE_OPENAI_ENDPOINT containing "