diff --git a/test/extended/apiserver/tls.go b/test/extended/apiserver/tls.go
index 58ac08e1524d..612387341ffa 100644
--- a/test/extended/apiserver/tls.go
+++ b/test/extended/apiserver/tls.go
@@ -47,7 +47,13 @@ var _ = g.Describe("[sig-api-machinery][Feature:APIServer]", func() {
 		}
 	})
 
-	g.It("TestTLSMinimumVersions", func() {
+	g.It("TestTLSMinimumVersions [FeatureGate:TLSAdherence] [apigroup:config.openshift.io]", func() {
+		ctx := context.Background()
+		enabled, err := isTLSAdherenceFeatureGateEnabled(ctx, oc)
+		o.Expect(err).NotTo(o.HaveOccurred())
+		if !enabled {
+			g.Skip("TLSAdherence feature gate is not enabled on this cluster")
+		}
 
 		g.By("Getting the APIServer configuration")
 		config, err := oc.AdminConfigClient().ConfigV1().APIServers().Get(ctx, "cluster", metav1.GetOptions{})
@@ -111,10 +117,15 @@ var _ = g.Describe("[sig-api-machinery][Feature:APIServer]", func() {
 		o.Expect(err).NotTo(o.HaveOccurred())
 	})
 
-	g.It("TestTLSDefaults", func() {
+	g.It("TestTLSDefaults [FeatureGate:TLSAdherence] [apigroup:config.openshift.io]", func() {
+		enabled, err := isTLSAdherenceFeatureGateEnabled(context.Background(), oc)
+		o.Expect(err).NotTo(o.HaveOccurred())
+		if !enabled {
+			g.Skip("TLSAdherence feature gate is not enabled on this cluster")
+		}
 		t := g.GinkgoT()
 
-		_, err := e2e.LoadClientset(true)
+		_, err = e2e.LoadClientset(true)
 		o.Expect(err).NotTo(o.HaveOccurred())
 
 		g.By("Getting the APIServer config")
diff --git a/test/extended/apiserver/tls_adherence.go b/test/extended/apiserver/tls_adherence.go
new file mode 100644
index 000000000000..9f2d7865bb6e
--- /dev/null
+++ b/test/extended/apiserver/tls_adherence.go
@@ -0,0 +1,111 @@
+package apiserver
+
+import (
+	"context"
+	"fmt"
+
+	g "github.com/onsi/ginkgo/v2"
+	o "github.com/onsi/gomega"
+	configv1 "github.com/openshift/api/config/v1"
+	k8serrors "k8s.io/apimachinery/pkg/api/errors"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+
+	exutil "github.com/openshift/origin/test/extended/util"
+)
+
+// tlsAdherenceFeatureGateName is the name of the TLSAdherence feature gate as it
+// appears in featuregate/cluster .status.featureGates[].enabled[].name.
+const tlsAdherenceFeatureGateName = configv1.FeatureGateName("TLSAdherence")
+
+// isTLSAdherenceFeatureGateEnabled returns true when the TLSAdherence feature gate is
+// listed as enabled in the featuregate/cluster status.
+func isTLSAdherenceFeatureGateEnabled(ctx context.Context, oc *exutil.CLI) (bool, error) {
+	fg, err := oc.AdminConfigClient().ConfigV1().FeatureGates().Get(ctx, "cluster", metav1.GetOptions{})
+	if err != nil {
+		return false, fmt.Errorf("failed to get featuregate/cluster: %w", err)
+	}
+	for _, featureGateValues := range fg.Status.FeatureGates {
+		for _, enabledGate := range featureGateValues.Enabled {
+			if enabledGate.Name == tlsAdherenceFeatureGateName {
+				return true, nil
+			}
+		}
+	}
+	return false, nil
+}
+
+// These tests verify the TLSAdherence feature gate and the spec.tlsAdherence field on
+// apiservers/cluster (config.openshift.io/v1).  They are gated by [OCPFeatureGate:TLSAdherence]
+// for automatic pre-run filtering and include [FeatureGate:TLSAdherence] in each It description
+// so the test name matches the pattern queried by the openshift/api verify-feature-promotion
+// CI check in Sippy.
+var _ = g.Describe("[sig-api-machinery][OCPFeatureGate:TLSAdherence][Feature:TLSAdherence] TLSAdherence apiservers/cluster", func() {
+	defer g.GinkgoRecover()
+
+	oc := exutil.NewCLI("tls-adherence")
+
+	g.BeforeEach(func(ctx context.Context) {
+		enabled, err := isTLSAdherenceFeatureGateEnabled(ctx, oc)
+		o.Expect(err).NotTo(o.HaveOccurred())
+		if !enabled {
+			g.Skip("TLSAdherence feature gate is not enabled on this cluster")
+		}
+	})
+
+	// Test 1 – verify the API rejects an unrecognised spec.tlsAdherence value.
+	g.It("[FeatureGate:TLSAdherence] should reject an invalid spec.tlsAdherence value on apiservers/cluster [apigroup:config.openshift.io]", func(ctx context.Context) {
+		current, err := oc.AdminConfigClient().ConfigV1().APIServers().Get(ctx, "cluster", metav1.GetOptions{})
+		o.Expect(err).NotTo(o.HaveOccurred(), "failed to get apiservers/cluster")
+
+		desired := current.DeepCopy()
+		desired.Spec.TLSAdherence = configv1.TLSAdherencePolicy("InvalidValue")
+
+		_, err = oc.AdminConfigClient().ConfigV1().APIServers().Update(ctx, desired, metav1.UpdateOptions{
+			DryRun: []string{metav1.DryRunAll},
+		})
+		o.Expect(err).To(o.HaveOccurred(),
+			"apiservers/cluster should reject an invalid spec.tlsAdherence value")
+		o.Expect(k8serrors.IsInvalid(err)).To(o.BeTrue(),
+			"error should be a 422 Invalid, got: %v", err)
+	})
+
+	// Test 2 – verify the API server accepts and reflects all valid spec.tlsAdherence values via dry-run.
+	g.It("[FeatureGate:TLSAdherence] should accept and reflect all valid spec.tlsAdherence values on apiservers/cluster [apigroup:config.openshift.io]", func(ctx context.Context) {
+		validValues := []configv1.TLSAdherencePolicy{
+			configv1.TLSAdherencePolicyStrictAllComponents,
+			configv1.TLSAdherencePolicyLegacyAdheringComponentsOnly,
+		}
+
+		for _, value := range validValues {
+			current, err := oc.AdminConfigClient().ConfigV1().APIServers().Get(ctx, "cluster", metav1.GetOptions{})
+			o.Expect(err).NotTo(o.HaveOccurred(), "failed to get apiservers/cluster")
+
+			desired := current.DeepCopy()
+			desired.Spec.TLSAdherence = value
+
+			result, err := oc.AdminConfigClient().ConfigV1().APIServers().Update(ctx, desired, metav1.UpdateOptions{
+				DryRun: []string{metav1.DryRunAll},
+			})
+			o.Expect(err).NotTo(o.HaveOccurred(),
+				"apiservers/cluster should accept spec.tlsAdherence=%s", value)
+			o.Expect(result.Spec.TLSAdherence).To(
+				o.Equal(value),
+				"apiservers/cluster should reflect spec.tlsAdherence=%s", value)
+		}
+	})
+
+	// Test 3 – verify that no cluster operator is degraded when the TLSAdherence feature gate is active.
+	g.It("[FeatureGate:TLSAdherence] should not have any degraded cluster operators [apigroup:config.openshift.io]", func(ctx context.Context) {
+		coList, err := oc.AdminConfigClient().ConfigV1().ClusterOperators().List(ctx, metav1.ListOptions{})
+		o.Expect(err).NotTo(o.HaveOccurred(), "failed to list clusteroperators")
+
+		for _, co := range coList.Items {
+			for _, condition := range co.Status.Conditions {
+				if condition.Type == configv1.OperatorDegraded && condition.Status == configv1.ConditionTrue {
+					g.Fail(fmt.Sprintf("cluster operator %q is degraded: %s: %s",
+						co.Name, condition.Reason, condition.Message))
+				}
+			}
+		}
+	})
+})