diff --git a/instrumentation/opentelemetry-instrumentation-google-genai/.changelog/233.added b/instrumentation/opentelemetry-instrumentation-google-genai/.changelog/233.added
new file mode 100644
index 00000000..3ae4c5d4
--- /dev/null
+++ b/instrumentation/opentelemetry-instrumentation-google-genai/.changelog/233.added
@@ -0,0 +1 @@
+Add response.id semantic convention attribute to interactions telemetry.
diff --git a/instrumentation/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/interactions.py b/instrumentation/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/interactions.py
index 1d52e195..908daed9 100644
--- a/instrumentation/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/interactions.py
+++ b/instrumentation/opentelemetry-instrumentation-google-genai/src/opentelemetry/instrumentation/google_genai/interactions.py
@@ -131,6 +131,8 @@ def _apply_interaction_response_attributes(
     telemetry_handler: TelemetryHandler,
 ) -> None:
     invocation.response_model_name = response.model
+    if getattr(response, "id", None):
+        invocation.response_id = response.id
 
     usage = response.usage or Usage()
 
diff --git a/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/generate_content.py b/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/generate_content.py
index 8d7458ad..7cddd23f 100644
--- a/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/generate_content.py
+++ b/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/generate_content.py
@@ -15,6 +15,7 @@
 from opentelemetry.sdk._logs import LoggerProvider
 from opentelemetry.sdk.metrics import MeterProvider
 from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.test.weaver_live_check import LiveCheckReport
 from opentelemetry.test_util_genai.conformance import Scenario
 from opentelemetry.test_util_genai.instrumentor import instrument
 
@@ -49,3 +50,16 @@ def run(
                     model="gemini-2.5-flash",
                     contents="Say this is a test",
                 )
+
+    def validate(self, report: LiveCheckReport) -> None:
+        super().validate(report)
+        response_ids = [
+            attr["value"]
+            for entry in report["samples"]
+            if "span" in entry
+            for attr in entry["span"]["attributes"]
+            if attr["name"] == "gen_ai.response.id"
+        ]
+        assert response_ids == ["Ibo-aoj4EpSy1MkPsezpqQE"], (
+            f"Expected gen_ai.response.id ['Ibo-aoj4EpSy1MkPsezpqQE'] but saw {response_ids}"
+        )
diff --git a/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/inference.py b/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/inference.py
index e9a4bc48..fc4a863f 100644
--- a/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/inference.py
+++ b/instrumentation/opentelemetry-instrumentation-google-genai/tests/conformance/inference.py
@@ -15,6 +15,7 @@
 from opentelemetry.sdk._logs import LoggerProvider
 from opentelemetry.sdk.metrics import MeterProvider
 from opentelemetry.sdk.trace import TracerProvider
+from opentelemetry.test.weaver_live_check import LiveCheckReport
 from opentelemetry.test_util_genai.conformance import (
     ExpectedViolation,
     Scenario,
@@ -58,3 +59,20 @@ def run(
                     model="gemini-2.5-flash",
                     input="Hello, how can you help me today?",
                 )
+
+    def validate(self, report: LiveCheckReport) -> None:
+        super().validate(report)
+        response_ids = [
+            attr["value"]
+            for entry in report["samples"]
+            if "span" in entry
+            for attr in entry["span"]["attributes"]
+            if attr["name"] == "gen_ai.response.id"
+        ]
+        assert response_ids == [
+            "v1_ChdMaWM4YXF2ekNMQ1k5TW9QLUpHZ3dBYxIXTGljOGFxdnpDTENZOU1vUC1KR2d3QWM"
+        ], (
+            "Expected gen_ai.response.id "
+            "['v1_ChdMaWM4YXF2ekNMQ1k5TW9QLUpHZ3dBYxIXTGljOGFxdnpDTENZOU1vUC1KR2d3QWM'] "
+            f"but saw {response_ids}"
+        )
diff --git a/instrumentation/opentelemetry-instrumentation-google-genai/tests/interactions/base.py b/instrumentation/opentelemetry-instrumentation-google-genai/tests/interactions/base.py
index 2236463f..b5c93a94 100644
--- a/instrumentation/opentelemetry-instrumentation-google-genai/tests/interactions/base.py
+++ b/instrumentation/opentelemetry-instrumentation-google-genai/tests/interactions/base.py
@@ -170,6 +170,26 @@ def test_generated_span_has_minimal_genai_attributes(self) -> None:
             "generativelanguage.googleapis.com",
         )
 
+    def test_generated_span_has_response_id(self) -> None:
+        self.configure_valid_interaction(interaction_id="interaction-123")
+        self.run_interaction(
+            model="gemini-2.5-flash",
+            input="Follow-up question",
+        )
+        span = self.otel.get_span_named("interactions.create gemini-2.5-flash")
+        self.assertEqual(
+            span.attributes["gen_ai.response.id"], "interaction-123"
+        )
+        self.otel.assert_has_event_named(
+            "gen_ai.client.inference.operation.details"
+        )
+        event = self.otel.get_event_named(
+            "gen_ai.client.inference.operation.details"
+        )
+        self.assertEqual(
+            event.attributes["gen_ai.response.id"], "interaction-123"
+        )
+
     def test_span_and_event_still_written_when_response_is_exception(
         self,
     ) -> None: