diff --git a/tests/integration/fixtures/wait_until_mid_loop_timing.yaml b/tests/integration/fixtures/wait_until_mid_loop_timing.yaml
new file mode 100644
index 0000000000..32f59e81a1
--- /dev/null
+++ b/tests/integration/fixtures/wait_until_mid_loop_timing.yaml
@@ -0,0 +1,109 @@
+# Test for PR #11676 bug: wait_until timeout when triggered mid-component-loop
+# This demonstrates that App.get_loop_component_start_time() is stale when
+# wait_until is triggered partway through a component's loop execution
+
+esphome:
+  name: wait-mid-loop
+
+host:
+
+api:
+  actions:
+    - action: test_mid_loop_timeout
+      then:
+        - logger.log: "=== Test: wait_until triggered mid-loop should timeout correctly ==="
+
+        # Reset test state
+        - globals.set:
+            id: test_complete
+            value: 'false'
+
+        # Trigger the slow script that will call wait_until mid-execution
+        - script.execute: slow_script
+
+        # Wait for test to complete (should take ~300ms: 100ms delay + 200ms timeout)
+        - wait_until:
+            condition:
+              lambda: return id(test_complete);
+            timeout: 2s
+
+        - if:
+            condition:
+              lambda: return id(test_complete);
+            then:
+              - logger.log: "✓ Test PASSED: wait_until timed out correctly"
+            else:
+              - logger.log: "✗ Test FAILED: wait_until did not complete properly"
+
+logger:
+  level: DEBUG
+
+globals:
+  - id: test_complete
+    type: bool
+    restore_value: false
+    initial_value: 'false'
+
+  - id: test_condition
+    type: bool
+    restore_value: false
+    initial_value: 'false'
+
+  - id: timeout_start_time
+    type: uint32_t
+    restore_value: false
+    initial_value: '0'
+
+  - id: timeout_end_time
+    type: uint32_t
+    restore_value: false
+    initial_value: '0'
+
+script:
+  # This script simulates a component that takes time during its execution
+  # When wait_until is triggered mid-script, the loop_component_start_time
+  # will be stale (from when the script's component loop started)
+  - id: slow_script
+    then:
+      - logger.log: "Script: Starting, about to do some work..."
+
+      # Simulate component doing work for 100ms
+      # This represents time spent in a component's loop() before triggering wait_until
+      - delay: 100ms
+
+      - logger.log: "Script: 100ms elapsed, now starting wait_until with 200ms timeout"
+      - lambda: |-
+          // Record when timeout starts
+          id(timeout_start_time) = millis();
+          id(test_condition) = false;
+
+      # At this point:
+      # - Script component's loop started 100ms ago
+      # - App.loop_component_start_time_ = time from 100ms ago (stale!)
+      # - wait_until will capture millis() NOW (fresh)
+      # - BUG: loop() will use stale loop_component_start_time, causing immediate timeout
+
+      - wait_until:
+          condition:
+            lambda: return id(test_condition);
+          timeout: 200ms
+
+      - lambda: |-
+          // Record when timeout completes
+          id(timeout_end_time) = millis();
+          uint32_t elapsed = id(timeout_end_time) - id(timeout_start_time);
+
+          ESP_LOGD("TEST", "wait_until completed after %u ms (expected ~200ms)", elapsed);
+
+          // Check if timeout took approximately correct time
+          // Should be ~200ms, not <50ms (immediate timeout)
+          if (elapsed >= 150 && elapsed <= 250) {
+            ESP_LOGD("TEST", "✓ Timeout duration correct: %u ms", elapsed);
+            id(test_complete) = true;
+          } else {
+            ESP_LOGE("TEST", "✗ Timeout duration WRONG: %u ms (expected 150-250ms)", elapsed);
+            if (elapsed < 50) {
+              ESP_LOGE("TEST", "  → Likely BUG: Immediate timeout due to stale loop_component_start_time");
+            }
+            id(test_complete) = false;
+          }
diff --git a/tests/integration/test_wait_until_mid_loop_timing.py b/tests/integration/test_wait_until_mid_loop_timing.py
new file mode 100644
index 0000000000..3c0458be58
--- /dev/null
+++ b/tests/integration/test_wait_until_mid_loop_timing.py
@@ -0,0 +1,115 @@
+"""Integration test for PR #11676 mid-loop timing bug.
+
+This test validates that wait_until timeouts work correctly when triggered
+mid-component-loop, where App.get_loop_component_start_time() is stale.
+
+The bug: When wait_until is triggered partway through a component's loop execution
+(e.g., from a script or automation), the cached loop_component_start_time_ is stale
+relative to when the action was actually triggered. This causes timeout calculations
+to underflow and timeout immediately instead of waiting the specified duration.
+"""
+
+from __future__ import annotations
+
+import asyncio
+import re
+
+import pytest
+
+from .types import APIClientConnectedFactory, RunCompiledFunction
+
+
+@pytest.mark.asyncio
+@pytest.mark.xfail(
+    reason="PR #11676 causes wait_until to timeout immediately when triggered mid-loop"
+)
+async def test_wait_until_mid_loop_timing(
+    yaml_config: str,
+    run_compiled: RunCompiledFunction,
+    api_client_connected: APIClientConnectedFactory,
+) -> None:
+    """Test that wait_until timeout works when triggered mid-component-loop.
+
+    This test:
+    1. Executes a script that delays 100ms (simulating component work)
+    2. Then starts wait_until with 200ms timeout
+    3. Verifies timeout takes ~200ms, not <50ms (immediate timeout bug)
+    """
+    loop = asyncio.get_running_loop()
+
+    # Track test results
+    test_results = {
+        "timeout_duration": None,
+        "passed": False,
+        "failed": False,
+        "bug_detected": False,
+    }
+
+    # Patterns for log messages
+    timeout_duration = re.compile(r"wait_until completed after (\d+) ms")
+    test_pass = re.compile(r"✓ Timeout duration correct")
+    test_fail = re.compile(r"✗ Timeout duration WRONG")
+    bug_pattern = re.compile(r"Likely BUG: Immediate timeout")
+    test_passed = re.compile(r"✓ Test PASSED")
+    test_failed = re.compile(r"✗ Test FAILED")
+
+    test_complete = loop.create_future()
+
+    def check_output(line: str) -> None:
+        """Check log output for test results."""
+        # Extract timeout duration
+        match = timeout_duration.search(line)
+        if match:
+            test_results["timeout_duration"] = int(match.group(1))
+
+        if test_pass.search(line):
+            test_results["passed"] = True
+        if test_fail.search(line):
+            test_results["failed"] = True
+        if bug_pattern.search(line):
+            test_results["bug_detected"] = True
+
+        # Final test result
+        if (
+            test_passed.search(line)
+            or test_failed.search(line)
+            and not test_complete.done()
+        ):
+            test_complete.set_result(True)
+
+    async with (
+        run_compiled(yaml_config, line_callback=check_output),
+        api_client_connected() as client,
+    ):
+        # Get the test service
+        _, services = await client.list_entities_services()
+        test_service = next(
+            (s for s in services if s.name == "test_mid_loop_timeout"), None
+        )
+        assert test_service is not None, "test_mid_loop_timeout service not found"
+
+        # Execute the test
+        client.execute_service(test_service, {})
+
+        # Wait for test to complete (100ms delay + 200ms timeout + margins = ~500ms)
+        await asyncio.wait_for(test_complete, timeout=5.0)
+
+        # Verify results
+        assert test_results["timeout_duration"] is not None, (
+            "Timeout duration not reported"
+        )
+        assert test_results["passed"], (
+            f"Test failed: wait_until took {test_results['timeout_duration']}ms, expected ~200ms. "
+            f"Bug detected: {test_results['bug_detected']}"
+        )
+        assert not test_results["bug_detected"], (
+            f"BUG DETECTED: wait_until timed out immediately ({test_results['timeout_duration']}ms) "
+            "instead of waiting 200ms. This indicates stale loop_component_start_time."
+        )
+
+        # Additional validation: timeout should be ~200ms (150-250ms range)
+        duration = test_results["timeout_duration"]
+        assert 150 <= duration <= 250, (
+            f"Timeout duration {duration}ms outside expected range (150-250ms). "
+            f"This suggests timing regression from PR #11676."
+        )