diff --git a/mirascope/core/bedrock/_utils/_setup_call.py b/mirascope/core/bedrock/_utils/_setup_call.py
index 9d1441ced..b80099cf6 100644
--- a/mirascope/core/bedrock/_utils/_setup_call.py
+++ b/mirascope/core/bedrock/_utils/_setup_call.py
@@ -2,6 +2,7 @@
 
 from __future__ import annotations
 
+import os
 from collections.abc import AsyncGenerator, Awaitable, Callable, Coroutine, Generator
 from functools import wraps
 from typing import Any, ParamSpec, cast, overload
@@ -223,12 +224,23 @@ def setup_call(
 
     call_kwargs |= cast(BedrockCallKwargs, {"modelId": model, "messages": messages})
 
+    env_vars = {}
+    if access_key_id := os.getenv("AWS_ACCESS_KEY_ID"):
+        env_vars["aws_access_key_id"] = access_key_id
+    if secret_access_key := os.getenv("AWS_SECRET_ACCESS_KEY"):
+        env_vars["aws_secret_access_key"] = secret_access_key
+    if session_token := os.getenv("AWS_SESSION_TOKEN"):
+        env_vars["aws_session_token"] = session_token
+    if region_name := os.getenv("AWS_REGION_NAME"):
+        env_vars["region_name"] = region_name
+    if profile_name := os.getenv("AWS_PROFILE"):
+        env_vars["profile_name"] = profile_name
     if client is None:
         if fn_is_async(fn):
-            session = get_session()
+            session = get_session(env_vars=env_vars)
             _client = _AsyncBedrockRuntimeWrappedClient(session, model)
         else:
-            session = Session()
+            session = Session(**env_vars)
             _client = session.client("bedrock-runtime")
     else:
         _client = client
diff --git a/pyproject.toml b/pyproject.toml
index 041c41c8e..340cc2f5b 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "mirascope"
-version = "1.21.2"
+version = "1.21.3"
 description = "LLM abstractions that aren't obstructions"
 readme = "README.md"
 license = { file = "LICENSE" }
diff --git a/tests/core/bedrock/_utils/test_setup_call.py b/tests/core/bedrock/_utils/test_setup_call.py
index 7a16c0484..4a42eb0ce 100644
--- a/tests/core/bedrock/_utils/test_setup_call.py
+++ b/tests/core/bedrock/_utils/test_setup_call.py
@@ -493,3 +493,80 @@ async def fake_stream():
     mock_client.converse_stream.assert_called_once_with(param2="value2")
 
     mock_session.create_client.assert_called_once_with("bedrock-runtime")
+
+
+@patch("mirascope.core.bedrock._utils._setup_call.Session")
+@patch("mirascope.core.bedrock._utils._setup_call.get_session")
+@patch("mirascope.core.bedrock._utils._setup_call._utils", new_callable=MagicMock)
+def test_setup_call_env_vars(
+    mock_utils: MagicMock,
+    mock_get_session: MagicMock,
+    mock_session_class: MagicMock,
+    mock_base_setup_call: MagicMock,
+    monkeypatch: pytest.MonkeyPatch,
+) -> None:
+    """Test that environment variables are properly passed to Session and get_session."""
+    mock_utils.setup_call = mock_base_setup_call
+    mock_base_setup_call.return_value[1] = [
+        {"role": "user", "content": [{"text": "user test"}]},
+    ]
+    mock_base_setup_call.return_value[3] = {}
+
+    # Set environment variables
+    monkeypatch.setenv("AWS_ACCESS_KEY_ID", "test_access_key")
+    monkeypatch.setenv("AWS_SECRET_ACCESS_KEY", "test_secret_key")
+    monkeypatch.setenv("AWS_SESSION_TOKEN", "test_session_token")
+    monkeypatch.setenv("AWS_REGION_NAME", "us-west-2")
+    monkeypatch.setenv("AWS_PROFILE", "test_profile")
+
+    # Test sync client creation with env vars
+    setup_call(
+        model="anthropic.claude-v2",
+        client=None,
+        fn=MagicMock(),
+        fn_args={},
+        dynamic_config=None,
+        tools=None,
+        json_mode=False,
+        call_params={},
+        response_model=None,
+        stream=False,
+    )
+
+    # Verify Session was called with expected env vars
+    mock_session_class.assert_called_once_with(
+        aws_access_key_id="test_access_key",
+        aws_secret_access_key="test_secret_key",
+        aws_session_token="test_session_token",
+        region_name="us-west-2",
+        profile_name="test_profile",
+    )
+
+    # Test async client creation with env vars
+    async def async_fn(): ...
+
+    mock_session_class.reset_mock()
+
+    setup_call(
+        model="anthropic.claude-v2",
+        client=None,
+        fn=async_fn,
+        fn_args={},
+        dynamic_config=None,
+        tools=None,
+        json_mode=False,
+        call_params={},
+        response_model=None,
+        stream=False,
+    )
+
+    # Verify get_session was called with expected env vars
+    mock_get_session.assert_called_with(
+        env_vars={
+            "aws_access_key_id": "test_access_key",
+            "aws_secret_access_key": "test_secret_key",
+            "aws_session_token": "test_session_token",
+            "region_name": "us-west-2",
+            "profile_name": "test_profile",
+        }
+    )
diff --git a/uv.lock b/uv.lock
index 79671200f..554421aed 100644
--- a/uv.lock
+++ b/uv.lock
@@ -3168,7 +3168,7 @@ wheels = [
 
 [[package]]
 name = "mirascope"
-version = "1.21.1"
+version = "1.21.2"
 source = { editable = "." }
 dependencies = [
     { name = "docstring-parser" },