diff --git a/tests/integration/fixtures/api_reboot_timeout.yaml b/tests/integration/fixtures/api_reboot_timeout.yaml
new file mode 100644
index 0000000000..114dd2fece
--- /dev/null
+++ b/tests/integration/fixtures/api_reboot_timeout.yaml
@@ -0,0 +1,7 @@
+esphome:
+  name: api-reboot-test
+host:
+api:
+  reboot_timeout: 1s  # Very short timeout for fast testing
+logger:
+  level: DEBUG
diff --git a/tests/integration/test_api_reboot_timeout.py b/tests/integration/test_api_reboot_timeout.py
new file mode 100644
index 0000000000..9836b42025
--- /dev/null
+++ b/tests/integration/test_api_reboot_timeout.py
@@ -0,0 +1,38 @@
+"""Test API server reboot timeout functionality."""
+
+import asyncio
+import re
+
+import pytest
+
+from .types import RunCompiledFunction
+
+
+@pytest.mark.asyncio
+async def test_api_reboot_timeout(
+    yaml_config: str,
+    run_compiled: RunCompiledFunction,
+) -> None:
+    """Test that the device reboots when no API clients connect within the timeout."""
+    reboot_detected = False
+    reboot_pattern = re.compile(r"No client connected; rebooting")
+
+    def check_output(line: str) -> None:
+        """Check output for reboot message."""
+        nonlocal reboot_detected
+        if reboot_pattern.search(line):
+            reboot_detected = True
+
+    # Run the device without connecting any API client
+    async with run_compiled(yaml_config, line_callback=check_output):
+        # Wait for up to 3 seconds for the reboot to occur
+        # (1s timeout + some margin for processing)
+        start_time = asyncio.get_event_loop().time()
+        while not reboot_detected:
+            await asyncio.sleep(0.1)
+            elapsed = asyncio.get_event_loop().time() - start_time
+            if elapsed > 3.0:
+                pytest.fail("Device did not reboot within expected timeout")
+
+    # Verify that reboot was detected
+    assert reboot_detected, "Reboot message was not detected in output"