diff --git a/conformance/tests/tlsroute-terminate-simple-same-namespace.go b/conformance/tests/tlsroute-terminate-simple-same-namespace.go
new file mode 100644
index 0000000000..2ff96d9c4b
--- /dev/null
+++ b/conformance/tests/tlsroute-terminate-simple-same-namespace.go
@@ -0,0 +1,129 @@
+/*
+Copyright 2025 The Kubernetes Authors.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package tests
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"sync"
+	"testing"
+	"time"
+
+	"k8s.io/apimachinery/pkg/types"
+
+	"sigs.k8s.io/gateway-api/conformance/utils/kubernetes"
+	"sigs.k8s.io/gateway-api/conformance/utils/suite"
+	"sigs.k8s.io/gateway-api/pkg/features"
+
+	mqtt "github.com/eclipse/paho.mqtt.golang"
+)
+
+func init() {
+	ConformanceTests = append(ConformanceTests, TLSRouteTerminateSimpleSameNamespace)
+}
+
+var TLSRouteTerminateSimpleSameNamespace = suite.ConformanceTest{
+	ShortName:   "TLSRouteTerminateSimpleSameNamespace",
+	Description: "A single TLSRoute in the gateway-conformance-infra namespace attaches to a Gateway using Terminate mode in the same namespace",
+	Features: []features.FeatureName{
+		features.SupportGateway,
+		features.SupportTLSRoute,
+		features.SupportTLSRouteModeTerminate,
+	},
+	Provisional: true,
+	Manifests:   []string{"tests/tlsroute-terminate-simple-same-namespace.yaml"},
+	Test: func(t *testing.T, suite *suite.ConformanceTestSuite) {
+		ns := "gateway-conformance-infra"
+		routeNN := types.NamespacedName{Name: "gateway-conformance-mqtt-test", Namespace: ns}
+		gwNN := types.NamespacedName{Name: "gateway-tlsroute-terminate", Namespace: ns}
+		caCertNN := types.NamespacedName{Name: "tls-checks-ca-certificate", Namespace: ns}
+
+		kubernetes.NamespacesMustBeReady(t, suite.Client, suite.TimeoutConfig, []string{ns})
+
+		gwAddr, hostnames := kubernetes.GatewayAndTLSRoutesMustBeAccepted(t, suite.Client, suite.TimeoutConfig, suite.ControllerName, kubernetes.NewGatewayRef(gwNN), routeNN)
+		if len(hostnames) != 1 {
+			t.Fatalf("unexpected error in test configuration, found %d hostnames", len(hostnames))
+		}
+		serverStr := string(hostnames[0])
+
+		caConfigMap, err := kubernetes.GetConfigMapData(suite.Client, caCertNN)
+		if err != nil {
+			t.Fatalf("unexpected error finding TLS secret: %v", err)
+		}
+		caString, ok := caConfigMap["ca.crt"]
+		if !ok {
+			t.Fatalf("ca.crt not found in configmap: %s/%s", caCertNN.Namespace, caCertNN.Name)
+		}
+
+		t.Run("Simple MQTT TLS request matching TLSRoute should reach mqtt-backend", func(t *testing.T) {
+			t.Logf("Establishing MQTT connection to host %s via %s", serverStr, gwAddr)
+
+			certpool := x509.NewCertPool()
+			if !certpool.AppendCertsFromPEM([]byte(caString)) {
+				t.Fatal("Failed to append CA certificate")
+			}
+
+			opts := mqtt.NewClientOptions()
+			opts.AddBroker(fmt.Sprintf("tls://%s", gwAddr))
+			opts.SetTLSConfig(&tls.Config{
+				RootCAs:    certpool,
+				ServerName: serverStr,
+				MinVersion: tls.VersionTLS13,
+			})
+			opts.SetConnectRetry(true)
+
+			var wg sync.WaitGroup
+			wg.Add(1)
+
+			topic := "test/tlsroute-terminate"
+			opts.OnConnect = func(c mqtt.Client) {
+				t.Log("Connected to MQTT broker")
+
+				if token := c.Subscribe(topic, 0, func(_ mqtt.Client, msg mqtt.Message) {
+					t.Logf("Received message: %s\n", string(msg.Payload()))
+					wg.Done()
+				}); token.Wait() && token.Error() != nil {
+					t.Fatalf("Failed to subscribe: %v", token.Error())
+				}
+
+				t.Log("Subscribed, publishing test message...")
+				if token := c.Publish(topic, 0, false, "Hello TLSRoute Terminate MQTT!"); token.Wait() && token.Error() != nil {
+					t.Fatalf("Failed to publish: %v", token.Error())
+				}
+			}
+
+			client := mqtt.NewClient(opts)
+			if token := client.Connect(); token.Wait() && token.Error() != nil {
+				t.Fatalf("Connection failed: %v", token.Error())
+			}
+
+			waitCh := make(chan struct{})
+			go func() {
+				wg.Wait()
+				close(waitCh)
+			}()
+
+			select {
+			case <-waitCh:
+				t.Log("Round-trip test succeeded")
+			case <-time.After(5 * time.Second):
+				t.Fatal("Timed out waiting for message")
+			}
+		})
+	},
+}
diff --git a/conformance/tests/tlsroute-terminate-simple-same-namespace.yaml b/conformance/tests/tlsroute-terminate-simple-same-namespace.yaml
new file mode 100644
index 0000000000..00b8e6fee1
--- /dev/null
+++ b/conformance/tests/tlsroute-terminate-simple-same-namespace.yaml
@@ -0,0 +1,95 @@
+apiVersion: gateway.networking.k8s.io/v1alpha3
+kind: TLSRoute
+metadata:
+  name: gateway-conformance-mqtt-test
+  namespace: gateway-conformance-infra
+spec:
+  parentRefs:
+  - name: gateway-tlsroute-terminate
+    namespace: gateway-conformance-infra
+  hostnames:
+  - tls.example.com
+  rules:
+  - backendRefs:
+    - name: mqtt-backend
+      port: 1883
+---
+apiVersion: gateway.networking.k8s.io/v1
+kind: Gateway
+metadata:
+  name: gateway-tlsroute-terminate
+  namespace: gateway-conformance-infra
+spec:
+  gatewayClassName: "{GATEWAY_CLASS_NAME}"
+  listeners:
+  - name: mqtt
+    port: 8883
+    protocol: TLS
+    hostname: tls.example.com
+    allowedRoutes:
+      namespaces:
+        from: Same
+      kinds:
+      - kind: TLSRoute
+    tls:
+      mode: Terminate
+      certificateRefs:
+      - name: tls-terminate-checks-certificate
+---
+apiVersion: v1
+kind: Service
+metadata:
+  name: mqtt-backend
+  namespace: gateway-conformance-infra
+spec:
+  selector:
+    app: mqtt-backend
+  ports:
+  - protocol: TCP
+    port: 1883
+    targetPort: 1883
+---
+apiVersion: apps/v1
+kind: Deployment
+metadata:
+  name: mqtt-backend
+  namespace: gateway-conformance-infra
+  labels:
+    app: mqtt-backend
+spec:
+  replicas: 1
+  selector:
+    matchLabels:
+      app: mqtt-backend
+  template:
+    metadata:
+      labels:
+        app: mqtt-backend
+    spec:
+      containers:
+      - name: mqtt-backend
+        # https://hub.docker.com/_/eclipse-mosquitto
+        image: eclipse-mosquitto:2
+        volumeMounts:
+        - name: config
+          mountPath: /mosquitto/config/mosquitto.conf
+          subPath: mosquitto.conf
+        ports:
+        - containerPort: 1883
+        resources:
+          requests:
+            cpu: 10m
+      volumes:
+      - name: config
+        configMap:
+          name: mosquitto-config
+---
+apiVersion: v1
+kind: ConfigMap
+metadata:
+  name: mosquitto-config
+  namespace: gateway-conformance-infra
+data:
+  mosquitto.conf: |
+    listener 1883
+    allow_anonymous true
diff --git a/conformance/utils/kubernetes/helpers.go b/conformance/utils/kubernetes/helpers.go
index d32899e20e..f395bb06bf 100644
--- a/conformance/utils/kubernetes/helpers.go
+++ b/conformance/utils/kubernetes/helpers.go
@@ -1037,3 +1037,17 @@ func BackendTLSPolicyMustHaveLatestConditions(t *testing.T, r *gatewayv1.Backend
 		}
 	}
 }
+
+// GetConfigMapData fetches the named ConfigMap
+func GetConfigMapData(client client.Client, name types.NamespacedName) (map[string]string, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	configMap := &v1.ConfigMap{}
+	err := client.Get(ctx, name, configMap)
+	if err != nil {
+		return nil, fmt.Errorf("error fetching ConfigMap: %w", err)
+	}
+
+	return configMap.Data, nil
+}
diff --git a/conformance/utils/suite/profiles.go b/conformance/utils/suite/profiles.go
index 996fe346dd..f7e21f7f6c 100644
--- a/conformance/utils/suite/profiles.go
+++ b/conformance/utils/suite/profiles.go
@@ -93,7 +93,10 @@ var (
 			features.SupportReferenceGrant,
 			features.SupportTLSRoute,
 		),
-		ExtendedFeatures: features.SetsToNamesSet(features.GatewayExtendedFeatures),
+		ExtendedFeatures: features.SetsToNamesSet(
+			features.GatewayExtendedFeatures,
+			features.TLSRouteExtendedFeatures,
+		),
 	}
 
 	// GatewayGRPCConformanceProfile is a ConformanceProfile that covers testing GRPC
diff --git a/conformance/utils/suite/suite.go b/conformance/utils/suite/suite.go
index 5df2c722d9..dd3a3cd87c 100644
--- a/conformance/utils/suite/suite.go
+++ b/conformance/utils/suite/suite.go
@@ -384,6 +384,10 @@ func (suite *ConformanceTestSuite) Setup(t *testing.T, tests []ConformanceTest)
 		secret = kubernetes.MustCreateCASignedCertSecret(t, "gateway-conformance-infra", "tls-checks-certificate", []string{"abc.example.com", "spiffe://abc.example.com/test-identity", "other.example.com"}, ca, caPrivKey)
 		suite.Applier.MustApplyObjectsWithCleanup(t, suite.Client, suite.TimeoutConfig, []client.Object{secret}, suite.Cleanup)
 
+		// The following secret is used for TLSRoute mode Terminate validation
+		secret = kubernetes.MustCreateCASignedCertSecret(t, "gateway-conformance-infra", "tls-terminate-checks-certificate", []string{"tls.example.com"}, ca, caPrivKey)
+		suite.Applier.MustApplyObjectsWithCleanup(t, suite.Client, suite.TimeoutConfig, []client.Object{secret}, suite.Cleanup)
+
 		// The following CA ceritficate is used for BackendTLSPolicy testing to intentionally force TLS validation to fail.
 		caConfigMap, _, _ = kubernetes.MustCreateCACertConfigMap(t, "gateway-conformance-infra", "mismatch-ca-certificate")
 		suite.Applier.MustApplyObjectsWithCleanup(t, suite.Client, suite.TimeoutConfig, []client.Object{caConfigMap}, suite.Cleanup)
diff --git a/go.mod b/go.mod
index 0536504b04..1808f801f7 100644
--- a/go.mod
+++ b/go.mod
@@ -3,6 +3,7 @@ module sigs.k8s.io/gateway-api
 go 1.24.0
 
 require (
+	github.com/eclipse/paho.mqtt.golang v1.5.1
 	github.com/miekg/dns v1.1.68
 	github.com/stretchr/testify v1.11.1
 	golang.org/x/net v0.46.0
diff --git a/go.sum b/go.sum
index d4c3b81a6c..0bff497b03 100644
--- a/go.sum
+++ b/go.sum
@@ -10,6 +10,8 @@ github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSs
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc h1:U9qPSI2PIWSS1VwoXQT9A3Wy9MM3WgvqSxFWenqJduM=
 github.com/davecgh/go-spew v1.1.2-0.20180830191138-d8f796af33cc/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
+github.com/eclipse/paho.mqtt.golang v1.5.1 h1:/VSOv3oDLlpqR2Epjn1Q7b2bSTplJIeV2ISgCl2W7nE=
+github.com/eclipse/paho.mqtt.golang v1.5.1/go.mod h1:1/yJCneuyOoCOzKSsOTUc0AJfpsItBGWvYpBLimhArU=
 github.com/emicklei/go-restful/v3 v3.13.0 h1:C4Bl2xDndpU6nJ4bc1jXd+uTmYPVUwkD6bFY/oTyCes=
 github.com/emicklei/go-restful/v3 v3.13.0/go.mod h1:6n3XBCmQQb25CM2LCACGz8ukIrRry+4bhvbpWn3mrbc=
 github.com/evanphx/json-patch/v5 v5.9.11 h1:/8HVnzMq13/3x9TPvjG08wUGqBTmZBsCWzjTM0wiaDU=
diff --git a/pkg/features/features.go b/pkg/features/features.go
index 1fbf43f0e6..52e58cc8c2 100644
--- a/pkg/features/features.go
+++ b/pkg/features/features.go
@@ -58,6 +58,7 @@ var (
 			Insert(HTTPRouteCoreFeatures.UnsortedList()...).
 			Insert(HTTPRouteExtendedFeatures.UnsortedList()...).
 			Insert(TLSRouteCoreFeatures.UnsortedList()...).
+			Insert(TLSRouteExtendedFeatures.UnsortedList()...).
 			Insert(MeshCoreFeatures.UnsortedList()...).
 			Insert(MeshExtendedFeatures.UnsortedList()...).
 			Insert(GRPCRouteCoreFeatures.UnsortedList()...).
diff --git a/pkg/features/tlsroute.go b/pkg/features/tlsroute.go
index 90d68c3d34..b0dd499fba 100644
--- a/pkg/features/tlsroute.go
+++ b/pkg/features/tlsroute.go
@@ -25,16 +25,33 @@ import "k8s.io/apimachinery/pkg/util/sets"
 const (
 	// This option indicates support for TLSRoute
 	SupportTLSRoute FeatureName = "TLSRoute"
+
+	// This option indicates support for TLSRoute mode Terminate (extended conformance)
+	SupportTLSRouteModeTerminate FeatureName = "TLSRouteModeTerminate"
 )
 
-// TLSRouteFeature contains metadata for the TLSRoute feature.
-var TLSRouteFeature = Feature{
-	Name:    SupportTLSRoute,
-	Channel: FeatureChannelExperimental,
-}
+var (
+	// TLSRouteFeature contains metadata for the TLSRoute feature.
+	TLSRouteFeature = Feature{
+		Name:    SupportTLSRoute,
+		Channel: FeatureChannelExperimental,
+	}
+	// TLSRouteModeTerminate contains metadata for the TLSRouteModeTerminate feature.
+	TLSRouteModeTerminateFeature = Feature{
+		Name:    SupportTLSRouteModeTerminate,
+		Channel: FeatureChannelExperimental,
+	}
+)
 
 // TLSCoreFeatures includes all the supported features for the TLSRoute API at
 // a Core level of support.
 var TLSRouteCoreFeatures = sets.New(
 	TLSRouteFeature,
 )
+
+// TLSRouteExtendedFeatures includes all extended features for TLSRoute
+// conformance and can be used to opt-in to run all TLSRoute extended features tests.
+// This does not include any Core Features.
+var TLSRouteExtendedFeatures = sets.New(
+	TLSRouteModeTerminateFeature,
+)