diff --git a/assets/components/openshift-router/deployment.yaml b/assets/components/openshift-router/deployment.yaml
index af1f48f67f..cb2c7b5f31 100644
--- a/assets/components/openshift-router/deployment.yaml
+++ b/assets/components/openshift-router/deployment.yaml
@@ -58,6 +58,8 @@ spec:
               value: '{{ .ThreadCount }}'
             - name: SSL_MIN_VERSION
               value: '{{ .RouterSSLMinVersion }}'
+            - name: ROUTER_CURVES
+              value: '{{ .RouterTLSCurves }}'
             - name: ROUTER_USE_PROXY_PROTOCOL
               value: "false"
             - name: GRACEFUL_SHUTDOWN_DELAY
diff --git a/pkg/components/controllers.go b/pkg/components/controllers.go
index e9bdf7af50..290b7a16b2 100644
--- a/pkg/components/controllers.go
+++ b/pkg/components/controllers.go
@@ -27,6 +27,9 @@ const (
 	haproxyMaxTimeoutMilliseconds = 2147483647 * time.Millisecond
 )
 
+// isFIPSEnabled reports whether the cluster has FIPS enabled.
+var isFIPSEnabled = detectFIPS()
+
 var (
 	tlsVersion13Ciphers = sets.NewString(
 		"TLS_AES_128_GCM_SHA256",
@@ -35,8 +38,41 @@ var (
 		"TLS_AES_128_CCM_SHA256",
 		"TLS_AES_128_CCM_8_SHA256",
 	)
+
+	fipsApprovedTLS13Ciphers = sets.NewString(
+		"TLS_AES_128_GCM_SHA256",
+		"TLS_AES_256_GCM_SHA384",
+	)
 )
 
+// detectFIPS reports whether the cluster is operating in FIPS
+// mode by checking the FIPS_ENABLED environment variable if set or
+// the /proc/sys/crypto/fips_enabled file otherwise.
+func detectFIPS() bool {
+	if v, ok := os.LookupEnv("FIPS_ENABLED"); ok {
+		if result, err := strconv.ParseBool(v); err != nil {
+			klog.Warningf("Failed to parse FIPS_ENABLED environment variable: %v; falling back to procfs", err)
+		} else {
+			klog.Infof("Found FIPS_ENABLED environment variable: value=%s, result=%v", v, result)
+			return result
+		}
+	}
+
+	result := false
+	data, err := os.ReadFile("/proc/sys/crypto/fips_enabled")
+	if err != nil {
+		klog.Warningf("Failed to read /proc/sys/crypto/fips_enabled: %v; assuming FIPS is not enabled", err)
+		return result
+	}
+	if len(data) == 0 {
+		klog.Warningf("Got empty /proc/sys/crypto/fips_enabled; assuming FIPS is not enabled")
+		return result
+	}
+	result = data[0] == '1'
+	klog.Infof("Read /proc/sys/crypto/fips_enabled: data=%s, result=%v", string(data), result)
+	return result
+}
+
 func startServiceCAController(ctx context.Context, cfg *config.Config, kubeconfigPath string) error {
 	var (
 		//TODO: fix the rolebinding and sa
@@ -472,12 +508,34 @@ func generateIngressParams(cfg *config.Config) (assets.RenderParams, error) {
 		}
 	}
 
+	// On FIPS-enabled clusters, remove non-FIPS-compliant TLS 1.3 cipher
+	// suites (e.g. TLS_CHACHA20_POLY1305_SHA256). HAProxy would fail TLS
+	// handshakes when a client offers a non-FIPS cipher first if that cipher
+	// is listed in ssl-default-bind-ciphersuites but excluded by the OS FIPS policy.
+	if isFIPSEnabled {
+		fipsCiphers := tls13Ciphers[:0]
+		for _, c := range tls13Ciphers {
+			if fipsApprovedTLS13Ciphers.Has(c) {
+				fipsCiphers = append(fipsCiphers, c)
+			}
+		}
+		tls13Ciphers = fipsCiphers
+	}
+
 	RouterCiphers := strings.Join(otherCiphers, ":")
 	RouterCiphersSuites := ""
 	if len(tls13Ciphers) != 0 {
 		RouterCiphersSuites = strings.Join(tls13Ciphers, ":")
 	}
 
+	// Default TLS supportedGroups (curves) include X25519MLKEM768 for
+	// post-quantum readiness. In FIPS mode, ML-KEM and X25519 are not
+	// supported by OpenSSL FIPS 140-3.
+	tlsCurves := "X25519MLKEM768:X25519:P-256:P-384:P-521"
+	if isFIPSEnabled {
+		tlsCurves = "P-256:P-384:P-521"
+	}
+
 	var RouterSSLMinVersion string
 	switch tlsProfileSpec.MinTLSVersion {
 	// TLS 1.0 is not supported, convert to TLS 1.1.
@@ -569,6 +627,7 @@ func generateIngressParams(cfg *config.Config) (assets.RenderParams, error) {
 		"RouterCiphers":               RouterCiphers,
 		"RouterCiphersSuites":         RouterCiphersSuites,
 		"RouterSSLMinVersion":         RouterSSLMinVersion,
+		"RouterTLSCurves":             tlsCurves,
 		"RouterAllowWildcardRoutes":   RouterAllowWildcardRoutes,
 		"ClientCAMapName":             clientCAMapName,
 		"ClientAuthPolicy":            clientAuthPolicy,