diff --git a/operations/helm/charts/alloy/CHANGELOG.md b/operations/helm/charts/alloy/CHANGELOG.md
index 33fb59f7ce..a40a249902 100644
--- a/operations/helm/charts/alloy/CHANGELOG.md
+++ b/operations/helm/charts/alloy/CHANGELOG.md
@@ -16,6 +16,8 @@ Unreleased
 
 - Remove readiness probe using curl when http server port is disabled. (@kalleep)
 
+- Add option to support external autoscaler like KEDA. (@kimmj)
+
 1.2.1 (2025-08-07)
 ----------
 
diff --git a/operations/helm/charts/alloy/templates/controllers/deployment.yaml b/operations/helm/charts/alloy/templates/controllers/deployment.yaml
index 2a7d618ee4..f190f996a9 100644
--- a/operations/helm/charts/alloy/templates/controllers/deployment.yaml
+++ b/operations/helm/charts/alloy/templates/controllers/deployment.yaml
@@ -14,7 +14,7 @@ metadata:
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:
-  {{- if (and (not .Values.controller.autoscaling.enabled) (not .Values.controller.autoscaling.horizontal.enabled)) }}
+  {{- if (and (not .Values.controller.autoscaling.enabled) (not .Values.controller.autoscaling.horizontal.enabled) (not .Values.controller.autoscaling.external)) }}
   replicas: {{ .Values.controller.replicas }}
   {{- end }}
   {{- if ge (int .Capabilities.KubeVersion.Minor) 22 }}
diff --git a/operations/helm/charts/alloy/templates/controllers/statefulset.yaml b/operations/helm/charts/alloy/templates/controllers/statefulset.yaml
index 2e5580eec4..514d7cecd8 100644
--- a/operations/helm/charts/alloy/templates/controllers/statefulset.yaml
+++ b/operations/helm/charts/alloy/templates/controllers/statefulset.yaml
@@ -17,7 +17,7 @@ metadata:
     {{- toYaml . | nindent 4 }}
   {{- end }}
 spec:
-  {{- if (and (not .Values.controller.autoscaling.enabled) (not .Values.controller.autoscaling.horizontal.enabled)) }}
+  {{- if (and (not .Values.controller.autoscaling.enabled) (not .Values.controller.autoscaling.horizontal.enabled) (not .Values.controller.autoscaling.external)) }}
   replicas: {{ .Values.controller.replicas }}
   {{- end }}
   {{- if .Values.controller.parallelRollout }}
diff --git a/operations/helm/charts/alloy/values.yaml b/operations/helm/charts/alloy/values.yaml
index fe597f7450..cb4cd3846c 100644
--- a/operations/helm/charts/alloy/values.yaml
+++ b/operations/helm/charts/alloy/values.yaml
@@ -263,6 +263,8 @@ controller:
     # -- Creates a HorizontalPodAutoscaler for controller type deployment.
     # Deprecated: Please use controller.autoscaling.horizontal instead
     enabled: false
+    # -- Set `true` if you use external autoscaler like KEDA
+    external: false
     # -- The lower limit for the number of replicas to which the autoscaler can scale down.
     minReplicas: 1
     # -- The upper limit for the number of replicas to which the autoscaler can scale up.