diff --git a/helm/templates/deployment-vllm-multi.yaml b/helm/templates/deployment-vllm-multi.yaml
index 52d5ea902..7b57d6a33 100644
--- a/helm/templates/deployment-vllm-multi.yaml
+++ b/helm/templates/deployment-vllm-multi.yaml
@@ -471,7 +471,7 @@ spec:
             {{- toYaml $modelSpec.pvcStorage.emptyDir | nindent 12 }}
         {{- else if kindIs "string" $modelSpec.pvcStorage }}
           persistentVolumeClaim:
-            claimName: "{{ .Release.Name }}-{{$modelSpec.name}}-storage-claim"
+            claimName: {{ $modelSpec.pvcExistingClaimName | default (printf "%s-%s-storage-claim" .Release.Name $modelSpec.name) | quote }}
         {{- end }}
         {{- end }}
         {{- if $.Values.sharedPvcStorage.enabled }}
diff --git a/helm/templates/pvc.yaml b/helm/templates/pvc.yaml
index a23e83541..6ddfa10de 100644
--- a/helm/templates/pvc.yaml
+++ b/helm/templates/pvc.yaml
@@ -2,7 +2,7 @@
 {{- if .Values.servingEngineSpec.enableEngine -}}
 {{- range $modelSpec := .Values.servingEngineSpec.modelSpec }}
 {{- with $ -}}
-{{- if and (hasKey $modelSpec "pvcStorage") (not (empty $modelSpec.pvcStorage)) (kindIs "string" $modelSpec.pvcStorage) }}
+{{- if and (hasKey $modelSpec "pvcStorage") (not (empty $modelSpec.pvcStorage)) (kindIs "string" $modelSpec.pvcStorage) (empty $modelSpec.pvcExistingClaimName) }}
 apiVersion: v1
 kind: PersistentVolumeClaim
 metadata:
diff --git a/helm/tests/pvc_test.yaml b/helm/tests/pvc_test.yaml
index 6e068436e..76deb7737 100644
--- a/helm/tests/pvc_test.yaml
+++ b/helm/tests/pvc_test.yaml
@@ -66,3 +66,16 @@ tests:
           path: spec.selector.matchLabels
           value:
             model: "mistral"
+
+  - it: should not render a PVC when an existing claim is provided
+    set:
+      servingEngineSpec:
+        enableEngine: true
+        modelSpec:
+          - name: "test-model"
+            pvcStorage: "50Gi"
+            pvcExistingClaimName: "my-existing-claim"
+    asserts:
+      - template: pvc.yaml
+        hasDocuments:
+          count: 0
diff --git a/helm/values.yaml b/helm/values.yaml
index 3cc8a3125..0faa65e35 100644
--- a/helm/values.yaml
+++ b/helm/values.yaml
@@ -94,6 +94,11 @@ servingEngineSpec:
     pvcLabels: {}
     # -- The annotations to add to the PVC
     pvcAnnotations: {}
+    # Use an externally-managed PersistentVolumeClaim instead of one created by
+    # this chart. When set, the chart skips rendering the PVC and mounts the
+    # named claim directly (useful for GitOps setups where PVCs are managed
+    # outside the chart). Leave unset to have the chart create the PVC.
+    # pvcExistingClaimName: "my-existing-claim"
     # -- Additional volumes to add to the pod, in Kubernetes volume format
     extraVolumes: []
       # - name: tmp-volume