diff --git a/chart/templates/_helpers.tpl b/chart/templates/_helpers.tpl
index 9c6c892..3fbc2ac 100644
--- a/chart/templates/_helpers.tpl
+++ b/chart/templates/_helpers.tpl
@@ -53,3 +53,14 @@ app.kubernetes.io/version: {{ .Chart.AppVersion }}
 {{ include "system_default_registry" . }}
 {{- end -}}
 {{- end -}}
+
+{{- /*
+ define the longhorn release namespace
+*/ -}}
+{{- define "release_namespace" -}}
+{{- if .Values.namespaceOverride -}}
+{{- .Values.namespaceOverride -}}
+{{- else -}}
+{{- .Release.Namespace -}}
+{{- end -}}
+{{- end -}}
diff --git a/chart/templates/clusterrolebinding.yaml b/chart/templates/clusterrolebinding.yaml
index 30c7fa7..66ac62f 100644
--- a/chart/templates/clusterrolebinding.yaml
+++ b/chart/templates/clusterrolebinding.yaml
@@ -10,4 +10,4 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: longhorn-service-account
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
diff --git a/chart/templates/daemonset-sa.yaml b/chart/templates/daemonset-sa.yaml
index f6e323b..e4c4ff1 100644
--- a/chart/templates/daemonset-sa.yaml
+++ b/chart/templates/daemonset-sa.yaml
@@ -4,7 +4,7 @@ metadata:
   labels: {{- include "longhorn.labels" . | nindent 4 }}
     app: longhorn-manager
   name: longhorn-manager
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 spec:
   selector:
     matchLabels:
@@ -97,7 +97,7 @@ metadata:
   labels: {{- include "longhorn.labels" . | nindent 4 }}
     app: longhorn-manager
   name: longhorn-backend
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 spec:
   type: {{ .Values.service.manager.type }}
   sessionAffinity: ClientIP
diff --git a/chart/templates/default-setting.yaml b/chart/templates/default-setting.yaml
index 48283c9..14c264e 100644
--- a/chart/templates/default-setting.yaml
+++ b/chart/templates/default-setting.yaml
@@ -2,7 +2,7 @@ apiVersion: v1
 kind: ConfigMap
 metadata:
   name: longhorn-default-setting
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
 data:
   default-setting.yaml: |-
diff --git a/chart/templates/deployment-driver.yaml b/chart/templates/deployment-driver.yaml
index 232358c..c4b6e35 100644
--- a/chart/templates/deployment-driver.yaml
+++ b/chart/templates/deployment-driver.yaml
@@ -2,7 +2,7 @@ apiVersion: apps/v1
 kind: Deployment
 metadata:
   name: longhorn-driver-deployer
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
 spec:
   replicas: 1
diff --git a/chart/templates/deployment-ui.yaml b/chart/templates/deployment-ui.yaml
index 027d54e..da7c0ea 100644
--- a/chart/templates/deployment-ui.yaml
+++ b/chart/templates/deployment-ui.yaml
@@ -4,7 +4,7 @@ metadata:
   labels: {{- include "longhorn.labels" . | nindent 4 }}
     app: longhorn-ui
   name: longhorn-ui
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 spec:
   replicas: 1
   selector:
@@ -41,7 +41,7 @@ metadata:
     kubernetes.io/cluster-service: "true"
     {{- end }}
   name: longhorn-frontend
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 spec:
   {{- if eq .Values.service.ui.type "Rancher-Proxy" }}
   type: ClusterIP
diff --git a/chart/templates/ingress.yaml b/chart/templates/ingress.yaml
index e3e9e3e..5b3a405 100644
--- a/chart/templates/ingress.yaml
+++ b/chart/templates/ingress.yaml
@@ -3,6 +3,7 @@ apiVersion: extensions/v1beta1
 kind: Ingress
 metadata:
   name: longhorn-ingress
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
     app: longhorn-ingress
   annotations:
diff --git a/chart/templates/postupgrade-job.yaml b/chart/templates/postupgrade-job.yaml
index e3559eb..6b6a385 100644
--- a/chart/templates/postupgrade-job.yaml
+++ b/chart/templates/postupgrade-job.yaml
@@ -5,7 +5,7 @@ metadata:
     "helm.sh/hook": post-upgrade
     "helm.sh/hook-delete-policy": hook-succeeded,before-hook-creation
   name: longhorn-post-upgrade
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
 spec:
   activeDeadlineSeconds: 900
diff --git a/chart/templates/psp.yaml b/chart/templates/psp.yaml
index 66479b4..a2dfc05 100644
--- a/chart/templates/psp.yaml
+++ b/chart/templates/psp.yaml
@@ -35,7 +35,7 @@ kind: Role
 metadata:
   name: longhorn-psp-role
   labels: {{- include "longhorn.labels" . | nindent 4 }}
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 rules:
 - apiGroups:
   - policy
@@ -51,7 +51,7 @@ kind: RoleBinding
 metadata:
   name: longhorn-psp-binding
   labels: {{- include "longhorn.labels" . | nindent 4 }}
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 roleRef:
   apiGroup: rbac.authorization.k8s.io
   kind: Role
@@ -59,8 +59,8 @@ roleRef:
 subjects:
 - kind: ServiceAccount
   name: longhorn-service-account
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
 - kind: ServiceAccount
   name: default
-  namespace: {{ .Release.Namespace }}
-{{- end }}
\ No newline at end of file
+  namespace: {{ include "release_namespace" . }}
+{{- end }}
diff --git a/chart/templates/registry-secret.yml b/chart/templates/registry-secret.yml
index 7112c89..1c7565f 100644
--- a/chart/templates/registry-secret.yml
+++ b/chart/templates/registry-secret.yml
@@ -3,6 +3,7 @@ apiVersion: v1
 kind: Secret
 metadata:
   name: {{ .Values.privateRegistry.registrySecret }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
 type: kubernetes.io/dockerconfigjson
 data:
diff --git a/chart/templates/serviceaccount.yaml b/chart/templates/serviceaccount.yaml
index a2280b4..ad576c3 100644
--- a/chart/templates/serviceaccount.yaml
+++ b/chart/templates/serviceaccount.yaml
@@ -2,5 +2,5 @@ apiVersion: v1
 kind: ServiceAccount
 metadata:
   name: longhorn-service-account
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
diff --git a/chart/templates/storageclass.yaml b/chart/templates/storageclass.yaml
index 6b82d41..dea6aaf 100644
--- a/chart/templates/storageclass.yaml
+++ b/chart/templates/storageclass.yaml
@@ -2,7 +2,7 @@ apiVersion: v1
 kind: ConfigMap
 metadata:
   name: longhorn-storageclass
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
 data:
   storageclass.yaml: |
diff --git a/chart/templates/tls-secrets.yaml b/chart/templates/tls-secrets.yaml
index 7a75df0..a7ebf13 100644
--- a/chart/templates/tls-secrets.yaml
+++ b/chart/templates/tls-secrets.yaml
@@ -4,6 +4,7 @@ apiVersion: v1
 kind: Secret
 metadata:
   name: longhorn
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
     app: longhorn
 type: kubernetes.io/tls
diff --git a/chart/templates/uninstall-job.yaml b/chart/templates/uninstall-job.yaml
index 6a36a16..e7e9f14 100644
--- a/chart/templates/uninstall-job.yaml
+++ b/chart/templates/uninstall-job.yaml
@@ -5,7 +5,7 @@ metadata:
     "helm.sh/hook": pre-delete
     "helm.sh/hook-delete-policy": hook-succeeded
   name: longhorn-uninstall
-  namespace: {{ .Release.Namespace }}
+  namespace: {{ include "release_namespace" . }}
   labels: {{- include "longhorn.labels" . | nindent 4 }}
 spec:
   activeDeadlineSeconds: 900
diff --git a/chart/values.yaml b/chart/values.yaml
index 2afe094..b6476a3 100644
--- a/chart/values.yaml
+++ b/chart/values.yaml
@@ -153,3 +153,7 @@ ingress:
 
 # Configure a pod security policy in the Longhorn namespace to allow privileged pods
 enablePSP: true
+
+## Specify override namespace, specifically this is useful for using longhorn as sub-chart
+## and its release namespace is not the `longhorn-system`
+namespaceOverride: ""