diff --git a/src/google/adk/__init__.py b/src/google/adk/__init__.py
index d48806bacd..ef5ee5a03a 100644
--- a/src/google/adk/__init__.py
+++ b/src/google/adk/__init__.py
@@ -13,11 +13,27 @@
 # limitations under the License.
 
 from __future__ import annotations
+from typing import TYPE_CHECKING
 
-from . import version
-from .agents.context import Context
-from .agents.llm_agent import Agent
-from .runners import Runner
+if TYPE_CHECKING:
+    from .agents.context import Context
+    from .agents.llm_agent import Agent
+    from .runners import Runner
+else:
+    import importlib
+
+    _LAZY_IMPORTS = {
+        "Agent": ".agents.llm_agent",
+        "Context": ".agents.context",
+        "Runner": ".runners",
+    }
 
+    def __getattr__(name: str):
+        if name in _LAZY_IMPORTS:
+            module = importlib.import_module(_LAZY_IMPORTS[name], __name__)
+            return getattr(module, name)
+        raise AttributeError(f"module {__name__} has no attribute {name}")
+
+from . import version
 __version__ = version.__version__
 __all__ = ["Agent", "Context", "Runner"]
diff --git a/src/google/adk/agents/__init__.py b/src/google/adk/agents/__init__.py
index fbd1808f3f..f8a27fa490 100644
--- a/src/google/adk/agents/__init__.py
+++ b/src/google/adk/agents/__init__.py
@@ -12,30 +12,57 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from .base_agent import BaseAgent
-from .context import Context
-from .invocation_context import InvocationContext
-from .live_request_queue import LiveRequest
-from .live_request_queue import LiveRequestQueue
-from .llm_agent import Agent
-from .llm_agent import LlmAgent
-from .loop_agent import LoopAgent
-from .mcp_instruction_provider import McpInstructionProvider
-from .parallel_agent import ParallelAgent
-from .run_config import RunConfig
-from .sequential_agent import SequentialAgent
+from __future__ import annotations
+from typing import TYPE_CHECKING
+
+if TYPE_CHECKING:
+    from .base_agent import BaseAgent
+    from .context import Context
+    from .invocation_context import InvocationContext
+    from .live_request_queue import LiveRequest
+    from .live_request_queue import LiveRequestQueue
+    from .llm_agent import Agent
+    from .llm_agent import LlmAgent
+    from .loop_agent import LoopAgent
+    from .mcp_instruction_provider import McpInstructionProvider
+    from .parallel_agent import ParallelAgent
+    from .run_config import RunConfig
+    from .sequential_agent import SequentialAgent
+else:
+    import importlib
+
+    _LAZY_IMPORTS = {
+        "Agent": ".llm_agent",
+        "BaseAgent": ".base_agent",
+        "Context": ".context",
+        "InvocationContext": ".invocation_context",
+        "LiveRequest": ".live_request_queue",
+        "LiveRequestQueue": ".live_request_queue",
+        "LlmAgent": ".llm_agent",
+        "LoopAgent": ".loop_agent",
+        "McpInstructionProvider": ".mcp_instruction_provider",
+        "ParallelAgent": ".parallel_agent",
+        "RunConfig": ".run_config",
+        "SequentialAgent": ".sequential_agent",
+    }
+
+    def __getattr__(name: str):
+        if name in _LAZY_IMPORTS:
+            module = importlib.import_module(_LAZY_IMPORTS[name], __name__)
+            return getattr(module, name)
+        raise AttributeError(f"module {__name__} has no attribute {name}")
 
 __all__ = [
-    'Agent',
-    'BaseAgent',
-    'Context',
-    'LlmAgent',
-    'LoopAgent',
-    'McpInstructionProvider',
-    'ParallelAgent',
-    'SequentialAgent',
-    'InvocationContext',
-    'LiveRequest',
-    'LiveRequestQueue',
-    'RunConfig',
+    "Agent",
+    "BaseAgent",
+    "Context",
+    "InvocationContext",
+    "LiveRequest",
+    "LiveRequestQueue",
+    "LlmAgent",
+    "LoopAgent",
+    "McpInstructionProvider",
+    "ParallelAgent",
+    "RunConfig",
+    "SequentialAgent",
 ]