diff --git a/charts/ingress-nginx/Chart.yaml b/charts/ingress-nginx/Chart.yaml
index 4e1fc67a59..d361b034cd 100644
--- a/charts/ingress-nginx/Chart.yaml
+++ b/charts/ingress-nginx/Chart.yaml
@@ -1,6 +1,7 @@
 annotations:
   artifacthub.io/changes: |
-     - "Update Ingress-Nginx version controller-v1.8.2"
+     - "Optional uppercase falue of appProtocol for controller service"
+     - "Making appProtocol available also on GKE k8s"
   artifacthub.io/prerelease: "false"
 apiVersion: v2
 appVersion: 1.8.2
@@ -20,4 +21,4 @@ maintainers:
 name: ingress-nginx
 sources:
 - https://github.com/kubernetes/ingress-nginx
-version: 4.7.2
+version: 4.7.3
diff --git a/charts/ingress-nginx/README.md b/charts/ingress-nginx/README.md
index 5487ca2186..5d52300feb 100644
--- a/charts/ingress-nginx/README.md
+++ b/charts/ingress-nginx/README.md
@@ -2,7 +2,7 @@
 
 [ingress-nginx](https://github.com/kubernetes/ingress-nginx) Ingress controller for Kubernetes using NGINX as a reverse proxy and load balancer
 
-![Version: 4.7.2](https://img.shields.io/badge/Version-4.7.2-informational?style=flat-square) ![AppVersion: 1.8.2](https://img.shields.io/badge/AppVersion-1.8.2-informational?style=flat-square)
+![Version: 4.7.3](https://img.shields.io/badge/Version-4.7.3-informational?style=flat-square) ![AppVersion: 1.8.2](https://img.shields.io/badge/AppVersion-1.8.2-informational?style=flat-square)
 
 To use, add `ingressClassName: nginx` spec field or the `kubernetes.io/ingress.class: nginx` annotation to your Ingress resources.
 
@@ -403,6 +403,7 @@ As of version `1.26.0` of this chart, by simply not providing any clusterIP valu
 | controller.scope.namespaceSelector | string | `""` | When scope.enabled == false, instead of watching all namespaces, we watching namespaces whose labels only match with namespaceSelector. Format like foo=bar. Defaults to empty, means watching all namespaces. |
 | controller.service.annotations | object | `{}` | Annotations are mandatory for the load balancer to come up. Varies with the cloud service. Values passed through helm tpl engine. |
 | controller.service.appProtocol | bool | `true` | If enabled is adding an appProtocol option for Kubernetes service. An appProtocol field replacing annotations that were using for setting a backend protocol. Here is an example for AWS: service.beta.kubernetes.io/aws-load-balancer-backend-protocol: http It allows choosing the protocol for each backend specified in the Kubernetes service. See the following GitHub issue for more details about the purpose: https://github.com/kubernetes/kubernetes/issues/40244 Will be ignored for Kubernetes versions older than 1.20 # |
+| controller.service.appProtocolInUpperCase | bool | `false` | If enabled,  appProtocol values will be in uppercase. (This is needed for example with GKE GatewayAPI - https://cloud.google.com/kubernetes-engine/docs/how-to/secure-gateway#restrictions_and_limitations) |
 | controller.service.enableHttp | bool | `true` |  |
 | controller.service.enableHttps | bool | `true` |  |
 | controller.service.enabled | bool | `true` |  |
diff --git a/charts/ingress-nginx/templates/controller-service.yaml b/charts/ingress-nginx/templates/controller-service.yaml
index f079fd4d82..6c16dbddde 100644
--- a/charts/ingress-nginx/templates/controller-service.yaml
+++ b/charts/ingress-nginx/templates/controller-service.yaml
@@ -57,8 +57,8 @@ spec:
       port: {{ .Values.controller.service.ports.http }}
       protocol: TCP
       targetPort: {{ .Values.controller.service.targetPorts.http }}
-    {{- if and (semverCompare ">=1.20" .Capabilities.KubeVersion.Version) (.Values.controller.service.appProtocol) }}
-      appProtocol: http
+    {{- if and (semverCompare ">=1.20.0-0" .Capabilities.KubeVersion.Version) (.Values.controller.service.appProtocol) }}
+      appProtocol: {{- if .Values.controller.service.appProtocolInUpperCase }} HTTP {{- else }} http {{ end }}
     {{- end }}
     {{- if (and $setNodePorts (not (empty .Values.controller.service.nodePorts.http))) }}
       nodePort: {{ .Values.controller.service.nodePorts.http }}
@@ -69,8 +69,8 @@ spec:
       port: {{ .Values.controller.service.ports.https }}
       protocol: TCP
       targetPort: {{ .Values.controller.service.targetPorts.https }}
-    {{- if and (semverCompare ">=1.20" .Capabilities.KubeVersion.Version) (.Values.controller.service.appProtocol) }}
-      appProtocol: https
+    {{- if and (semverCompare ">=1.20.0-0" .Capabilities.KubeVersion.Version) (.Values.controller.service.appProtocol) }}
+      appProtocol: {{- if .Values.controller.service.appProtocolInUpperCase }} HTTPS {{- else }} https {{ end }}
     {{- end }}
     {{- if (and $setNodePorts (not (empty .Values.controller.service.nodePorts.https))) }}
       nodePort: {{ .Values.controller.service.nodePorts.https }}
diff --git a/charts/ingress-nginx/values.yaml b/charts/ingress-nginx/values.yaml
index fffbe90b2e..fd9e672431 100644
--- a/charts/ingress-nginx/values.yaml
+++ b/charts/ingress-nginx/values.yaml
@@ -436,6 +436,8 @@ controller:
     # Will be ignored for Kubernetes versions older than 1.20
     ##
     appProtocol: true
+    # -- If enabled,  appProtocol values will be in uppercase. (This is needed for example with GKE GatewayAPI - https://cloud.google.com/kubernetes-engine/docs/how-to/secure-gateway#restrictions_and_limitations)
+    appProtocolInUpperCase: false
     # -- Annotations are mandatory for the load balancer to come up. Varies with the cloud service. Values passed through helm tpl engine.
     annotations: {}
     labels: {}