diff --git a/clients/aws-sdk-lex-runtime-v2/tests/integration/__init__.py b/clients/aws-sdk-lex-runtime-v2/tests/integration/__init__.py
new file mode 100644
index 0000000..0da32eb
--- /dev/null
+++ b/clients/aws-sdk-lex-runtime-v2/tests/integration/__init__.py
@@ -0,0 +1,21 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+from smithy_aws_core.identity import EnvironmentCredentialsResolver
+
+from aws_sdk_lex_runtime_v2.client import LexRuntimeV2Client
+from aws_sdk_lex_runtime_v2.config import Config
+
+BOT_ALIAS_ID = "TSTALIASID"
+LOCALE_ID = "en_US"
+REGION = "us-east-1"
+
+
+def create_lex_client(region: str) -> LexRuntimeV2Client:
+    return LexRuntimeV2Client(
+        config=Config(
+            endpoint_uri=f"https://runtime-v2-lex.{region}.amazonaws.com",
+            region=region,
+            aws_credentials_identity_resolver=EnvironmentCredentialsResolver(),
+        )
+    )
diff --git a/clients/aws-sdk-lex-runtime-v2/tests/integration/conftest.py b/clients/aws-sdk-lex-runtime-v2/tests/integration/conftest.py
new file mode 100644
index 0000000..8a2407c
--- /dev/null
+++ b/clients/aws-sdk-lex-runtime-v2/tests/integration/conftest.py
@@ -0,0 +1,140 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+"""Pytest fixtures for Lex Runtime V2 integration tests.
+
+Creates and tears down a Lex V2 bot with a Greeting intent once per
+test session. All integration tests receive the bot_id via the
+``lex_bot`` fixture.
+"""
+
+import json
+import uuid
+
+import boto3
+import pytest
+
+from . import LOCALE_ID, REGION
+
+_UNIQUE_SUFFIX = uuid.uuid4().hex
+ROLE_NAME = f"LexRuntimeV2IntegTestRole-{_UNIQUE_SUFFIX}"
+BOT_NAME = f"smithy-python-integ-test-bot-{_UNIQUE_SUFFIX}"
+
+
+def _create_lex_bot() -> str:
+    """Create a Lex V2 bot with a Greeting intent.
+
+    Returns:
+        The bot ID.
+    """
+    iam = boto3.client("iam")
+    lex = boto3.client("lexv2-models", region_name=REGION)
+    sts = boto3.client("sts")
+
+    account_id = sts.get_caller_identity()["Account"]
+    role_arn = f"arn:aws:iam::{account_id}:role/{ROLE_NAME}"
+
+    # Create IAM role for the bot
+    trust_policy = {
+        "Version": "2012-10-17",
+        "Statement": [
+            {
+                "Effect": "Allow",
+                "Principal": {"Service": "lexv2.amazonaws.com"},
+                "Action": "sts:AssumeRole",
+            }
+        ],
+    }
+    try:
+        iam.create_role(
+            RoleName=ROLE_NAME, AssumeRolePolicyDocument=json.dumps(trust_policy)
+        )
+    except iam.exceptions.EntityAlreadyExistsException:
+        pass
+
+    # Create bot
+    response = lex.create_bot(
+        botName=BOT_NAME,
+        roleArn=role_arn,
+        dataPrivacy={"childDirected": False},
+        # 5-minute idle timeout is sufficient for integration tests.
+        idleSessionTTLInSeconds=300,
+    )
+    bot_id = response["botId"]
+    lex.get_waiter("bot_available").wait(botId=bot_id)
+
+    # Create locale
+    lex.create_bot_locale(
+        botId=bot_id,
+        botVersion="DRAFT",
+        localeId=LOCALE_ID,
+        # Required field. Confidence threshold (0-1) that determines when Lex
+        # inserts AMAZON.FallbackIntent into the interpretations list.
+        # 0.40 is a reasonable value for a simple test bot.
+        nluIntentConfidenceThreshold=0.40,
+    )
+    lex.get_waiter("bot_locale_created").wait(
+        botId=bot_id, botVersion="DRAFT", localeId=LOCALE_ID
+    )
+
+    # Create intent
+    lex.create_intent(
+        intentName="Greeting",
+        botId=bot_id,
+        botVersion="DRAFT",
+        localeId=LOCALE_ID,
+        sampleUtterances=[
+            {"utterance": "Hello"},
+            {"utterance": "Hi"},
+            {"utterance": "Hey"},
+        ],
+        intentClosingSetting={
+            "closingResponse": {
+                "messageGroups": [
+                    {
+                        "message": {
+                            "plainTextMessage": {"value": "Hello! How can I help you?"}
+                        }
+                    }
+                ]
+            },
+            "active": True,
+        },
+    )
+
+    # Build locale
+    lex.build_bot_locale(botId=bot_id, botVersion="DRAFT", localeId=LOCALE_ID)
+    lex.get_waiter("bot_locale_built").wait(
+        botId=bot_id, botVersion="DRAFT", localeId=LOCALE_ID
+    )
+
+    return bot_id
+
+
+def _delete_lex_bot(bot_id: str | None) -> None:
+    """Delete a Lex V2 bot and its associated IAM role.
+
+    Args:
+        bot_id: The bot ID to delete, or None if creation failed.
+    """
+    lex = boto3.client("lexv2-models", region_name=REGION)
+    iam = boto3.client("iam")
+
+    if bot_id:
+        lex.delete_bot(botId=bot_id, skipResourceInUseCheck=True)
+
+    try:
+        iam.delete_role(RoleName=ROLE_NAME)
+    except iam.exceptions.NoSuchEntityException:
+        pass
+
+
+@pytest.fixture(scope="session")
+def lex_bot():
+    """Create a Lex bot for the test session and delete it after."""
+    bot_id = None
+    try:
+        bot_id = _create_lex_bot()
+        yield bot_id
+    finally:
+        _delete_lex_bot(bot_id)
diff --git a/clients/aws-sdk-lex-runtime-v2/tests/integration/test_bidirectional_streaming.py b/clients/aws-sdk-lex-runtime-v2/tests/integration/test_bidirectional_streaming.py
new file mode 100644
index 0000000..fc12bea
--- /dev/null
+++ b/clients/aws-sdk-lex-runtime-v2/tests/integration/test_bidirectional_streaming.py
@@ -0,0 +1,146 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+"""Test bidirectional streaming event stream handling."""
+
+import asyncio
+import uuid
+
+from smithy_core.aio.eventstream import DuplexEventStream
+
+from aws_sdk_lex_runtime_v2.models import (
+    StartConversationInput,
+    StartConversationRequestEventStream,
+    StartConversationRequestEventStreamConfigurationEvent,
+    StartConversationRequestEventStreamTextInputEvent,
+    StartConversationRequestEventStreamDisconnectionEvent,
+    StartConversationResponseEventStream,
+    StartConversationResponseEventStreamHeartbeatEvent,
+    StartConversationResponseEventStreamIntentResultEvent,
+    StartConversationResponseEventStreamTextResponseEvent,
+    StartConversationResponseEventStreamTranscriptEvent,
+    StartConversationOutput,
+    ConfigurationEvent,
+    TextInputEvent,
+    DisconnectionEvent,
+)
+from . import BOT_ALIAS_ID, LOCALE_ID, REGION, create_lex_client
+
+
+async def _send_events(
+    stream: DuplexEventStream[
+        StartConversationRequestEventStream,
+        StartConversationResponseEventStream,
+        StartConversationOutput,
+    ],
+) -> None:
+    """Send configuration, text input, and disconnection events."""
+    input_stream = stream.input_stream
+
+    await input_stream.send(
+        StartConversationRequestEventStreamConfigurationEvent(
+            value=ConfigurationEvent(response_content_type="text/plain; charset=utf-8")
+        )
+    )
+
+    await input_stream.send(
+        StartConversationRequestEventStreamTextInputEvent(
+            value=TextInputEvent(text="Hello")
+        )
+    )
+
+    await asyncio.sleep(3)
+
+    await input_stream.send(
+        StartConversationRequestEventStreamDisconnectionEvent(
+            value=DisconnectionEvent()
+        )
+    )
+
+    await input_stream.close()
+
+
+async def _receive_events(
+    stream: DuplexEventStream[
+        StartConversationRequestEventStream,
+        StartConversationResponseEventStream,
+        StartConversationOutput,
+    ],
+) -> tuple[bool, bool, bool, bool]:
+    """Receive and collect output from the stream.
+
+    Returns:
+        Tuple of (got_transcript, got_intent_result, got_text_response, got_heartbeat)
+    """
+    got_transcript = False
+    got_intent_result = False
+    got_text_response = False
+    got_heartbeat = False
+
+    _, output_stream = await stream.await_output()
+    if output_stream is None:
+        return got_transcript, got_intent_result, got_text_response, got_heartbeat
+
+    async for event in output_stream:
+        if isinstance(event, StartConversationResponseEventStreamTranscriptEvent):
+            got_transcript = True
+            assert event.value.event_id is not None
+            assert event.value.transcript == "Hello"
+        elif isinstance(event, StartConversationResponseEventStreamIntentResultEvent):
+            got_intent_result = True
+            assert event.value.event_id is not None
+            assert event.value.input_mode == "Text"
+            assert event.value.session_id is not None
+            assert event.value.session_state is not None
+            assert event.value.session_state.intent is not None
+            assert event.value.session_state.intent.name == "Greeting"
+            assert event.value.session_state.intent.state == "Fulfilled"
+            assert event.value.interpretations is not None
+            assert len(event.value.interpretations) == 2
+            interps_by_name = {
+                i.intent.name: i for i in event.value.interpretations if i.intent
+            }
+            assert "Greeting" in interps_by_name
+            assert "FallbackIntent" in interps_by_name
+            assert interps_by_name["Greeting"].nlu_confidence is not None
+            assert interps_by_name["Greeting"].nlu_confidence.score == 1.0
+        elif isinstance(event, StartConversationResponseEventStreamTextResponseEvent):
+            got_text_response = True
+            assert event.value.event_id is not None
+            assert event.value.messages is not None
+            assert len(event.value.messages) == 1
+            msg = event.value.messages[0]
+            assert msg.content_type == "PlainText"
+            assert msg.content == "Hello! How can I help you?"
+        elif isinstance(event, StartConversationResponseEventStreamHeartbeatEvent):
+            got_heartbeat = True
+            assert event.value.event_id is not None
+        else:
+            raise RuntimeError(
+                f"Received unexpected event type in stream: {type(event).__name__}"
+            )
+
+    return got_transcript, got_intent_result, got_text_response, got_heartbeat
+
+
+async def test_start_conversation(lex_bot: str) -> None:
+    """Test bidirectional streaming StartConversation operation."""
+    client = create_lex_client(REGION)
+
+    stream = await client.start_conversation(
+        input=StartConversationInput(
+            bot_id=lex_bot,
+            bot_alias_id=BOT_ALIAS_ID,
+            locale_id=LOCALE_ID,
+            session_id=str(uuid.uuid4()),
+            conversation_mode="TEXT",
+        )
+    )
+
+    results = await asyncio.gather(_send_events(stream), _receive_events(stream))
+
+    got_transcript, got_intent_result, got_text_response, got_heartbeat = results[1]
+    assert got_transcript, "Expected to receive a TranscriptEvent"
+    assert got_intent_result, "Expected to receive an IntentResultEvent"
+    assert got_text_response, "Expected to receive a TextResponseEvent"
+    assert got_heartbeat, "Expected to receive a HeartbeatEvent"
diff --git a/clients/aws-sdk-lex-runtime-v2/tests/integration/test_non_streaming.py b/clients/aws-sdk-lex-runtime-v2/tests/integration/test_non_streaming.py
new file mode 100644
index 0000000..d3abd05
--- /dev/null
+++ b/clients/aws-sdk-lex-runtime-v2/tests/integration/test_non_streaming.py
@@ -0,0 +1,48 @@
+# Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
+# SPDX-License-Identifier: Apache-2.0
+
+"""Test non-streaming output type handling."""
+
+import uuid
+
+from aws_sdk_lex_runtime_v2.models import RecognizeTextInput, RecognizeTextOutput
+from . import BOT_ALIAS_ID, LOCALE_ID, REGION, create_lex_client
+
+
+async def test_recognize_text(lex_bot: str) -> None:
+    """Test non-streaming RecognizeText operation."""
+    client = create_lex_client(REGION)
+    response = await client.recognize_text(
+        input=RecognizeTextInput(
+            bot_id=lex_bot,
+            bot_alias_id=BOT_ALIAS_ID,
+            locale_id=LOCALE_ID,
+            session_id=str(uuid.uuid4()),
+            text="Hello",
+        )
+    )
+
+    assert isinstance(response, RecognizeTextOutput)
+    assert response.session_id is not None
+
+    # Verify messages
+    assert response.messages is not None
+    assert len(response.messages) == 1
+    msg = response.messages[0]
+    assert msg.content_type == "PlainText"
+    assert msg.content == "Hello! How can I help you?"
+
+    # Verify session state
+    assert response.session_state is not None
+    assert response.session_state.intent is not None
+    assert response.session_state.intent.name == "Greeting"
+    assert response.session_state.intent.state == "Fulfilled"
+
+    # Verify interpretations
+    assert response.interpretations is not None
+    assert len(response.interpretations) == 2
+    interps_by_name = {i.intent.name: i for i in response.interpretations if i.intent}
+    assert "Greeting" in interps_by_name
+    assert "FallbackIntent" in interps_by_name
+    assert interps_by_name["Greeting"].nlu_confidence is not None
+    assert interps_by_name["Greeting"].nlu_confidence.score == 1.0