diff --git a/README.md b/README.md
index 12d4910f..df82def2 100644
--- a/README.md
+++ b/README.md
@@ -352,6 +352,7 @@ AnthropicBedrock(
   aws_secret_key='...',
   aws_access_key='...',
   aws_session_token='...',
+  api_key='...', # defaults to AWS_BEARER_TOKEN_BEDROCK envvar
 )
 ```
 
diff --git a/src/anthropic/lib/bedrock/_auth.py b/src/anthropic/lib/bedrock/_auth.py
index 0a8b2109..f0520543 100644
--- a/src/anthropic/lib/bedrock/_auth.py
+++ b/src/anthropic/lib/bedrock/_auth.py
@@ -41,7 +41,13 @@ def get_auth_headers(
     region: str | None,
     profile: str | None,
     data: str | None,
+    aws_bearer_token_bedrock: str | None = None,
 ) -> dict[str, str]:
+    if aws_bearer_token_bedrock is not None:
+        headers = headers.copy()
+        headers["Authorization"] = f"Bearer {aws_bearer_token_bedrock}"
+        return dict(headers)
+
     from botocore.auth import SigV4Auth
     from botocore.awsrequest import AWSRequest
 
diff --git a/src/anthropic/lib/bedrock/_client.py b/src/anthropic/lib/bedrock/_client.py
index 013d2702..443a135e 100644
--- a/src/anthropic/lib/bedrock/_client.py
+++ b/src/anthropic/lib/bedrock/_client.py
@@ -156,6 +156,7 @@ def __init__(
         # outlining your use-case to help us decide if it should be
         # part of our public interface in the future.
         _strict_response_validation: bool = False,
+        api_key: str | None = None,
     ) -> None:
         self.aws_secret_key = aws_secret_key
 
@@ -166,6 +167,11 @@ def __init__(
 
         self.aws_session_token = aws_session_token
 
+        if api_key is None:
+            api_key = os.environ.get("AWS_BEARER_TOKEN_BEDROCK")
+
+        self.api_key = api_key
+
         if base_url is None:
             base_url = os.environ.get("ANTHROPIC_BEDROCK_BASE_URL")
         if base_url is None:
@@ -210,6 +216,7 @@ def _prepare_request(self, request: httpx.Request) -> None:
             region=self.aws_region or "us-east-1",
             profile=self.aws_profile,
             data=data,
+            aws_bearer_token_bedrock=self.api_key,
         )
         request.headers.update(headers)
 
@@ -298,6 +305,7 @@ def __init__(
         # outlining your use-case to help us decide if it should be
         # part of our public interface in the future.
         _strict_response_validation: bool = False,
+        api_key: str | None = None,
     ) -> None:
         self.aws_secret_key = aws_secret_key
 
@@ -308,6 +316,11 @@ def __init__(
 
         self.aws_session_token = aws_session_token
 
+        if api_key is None:
+            api_key = os.environ.get("AWS_BEARER_TOKEN_BEDROCK")
+
+        self.api_key = api_key
+
         if base_url is None:
             base_url = os.environ.get("ANTHROPIC_BEDROCK_BASE_URL")
         if base_url is None:
@@ -352,6 +365,7 @@ async def _prepare_request(self, request: httpx.Request) -> None:
             region=self.aws_region or "us-east-1",
             profile=self.aws_profile,
             data=data,
+            aws_bearer_token_bedrock=self.api_key,
         )
         request.headers.update(headers)
 
diff --git a/tests/lib/test_bedrock.py b/tests/lib/test_bedrock.py
index fe62da43..210b499a 100644
--- a/tests/lib/test_bedrock.py
+++ b/tests/lib/test_bedrock.py
@@ -195,3 +195,51 @@ def test_region_infer_from_specified_profile(
     client = AnthropicBedrock()
 
     assert client.aws_region == next(profile for profile in profiles if profile["name"] == aws_profile)["region"]
+
+
+@pytest.mark.respx()
+def test_bearer_token_client_args(respx_mock: MockRouter) -> None:
+    respx_mock.post(re.compile(r"https://bedrock-runtime\.us-east-1\.amazonaws\.com/model/.*/invoke")).mock(
+        return_value=httpx.Response(200, json={"foo": "bar"})
+    )
+
+    client = AnthropicBedrock(aws_region="us-east-1", api_key="test-bearer-token-from-args")
+    client.messages.create(
+        max_tokens=1024,
+        messages=[
+            {
+                "role": "user",
+                "content": "Say hello there!",
+            }
+        ],
+        model="anthropic.claude-3-5-sonnet-20241022-v2:0",
+    )
+    calls = cast("list[MockRequestCall]", respx_mock.calls)
+    assert len(calls) == 1
+    auth_header = calls[0].request.headers.get("Authorization")
+    assert auth_header == "Bearer test-bearer-token-from-args"
+
+
+@pytest.mark.respx()
+def test_bearer_token_env(monkeypatch: pytest.MonkeyPatch, respx_mock: MockRouter) -> None:
+    respx_mock.post(re.compile(r"https://bedrock-runtime\.us-east-1\.amazonaws\.com/model/.*/invoke")).mock(
+        return_value=httpx.Response(200, json={"foo": "bar"})
+    )
+
+    monkeypatch.setenv("AWS_BEARER_TOKEN_BEDROCK", "test-bearer-token-from-env")
+
+    client = AnthropicBedrock(aws_region="us-east-1")
+    client.messages.create(
+        max_tokens=1024,
+        messages=[
+            {
+                "role": "user",
+                "content": "Say hello there!",
+            }
+        ],
+        model="anthropic.claude-3-5-sonnet-20241022-v2:0",
+    )
+    calls = cast("list[MockRequestCall]", respx_mock.calls)
+    assert len(calls) == 1
+    auth_header = calls[0].request.headers.get("Authorization")
+    assert auth_header == "Bearer test-bearer-token-from-env"