diff --git a/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml b/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml
index 5ef31be8..911c3d30 100755
--- a/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml
+++ b/charts/opensearch-operator/templates/opensearch-operator-controller-manager-deployment.yaml
@@ -51,8 +51,12 @@ spec:
         - --metrics-bind-address={{ .Values.manager.metricsBindAddress }}
         - --leader-elect
         {{- if .Values.manager.watchNamespace }}
+        {{- if kindIs "slice" .Values.manager.watchNamespace }}
+        - --watch-namespace={{ .Values.manager.watchNamespace | join "," }}
+        {{- else }}
         - --watch-namespace={{ .Values.manager.watchNamespace }}
         {{- end }}
+        {{- end }}
         - --loglevel={{ .Values.manager.loglevel }}
         command:
         - /manager
diff --git a/charts/opensearch-operator/values.yaml b/charts/opensearch-operator/values.yaml
index 7076e288..239ff952 100644
--- a/charts/opensearch-operator/values.yaml
+++ b/charts/opensearch-operator/values.yaml
@@ -63,6 +63,10 @@ manager:
 
   # If a watchNamespace is specified, the manager's cache will be restricted to
   # watch objects in the desired namespace. Defaults is to watch all namespaces.
+  # To watch multiple namespaces, separate them by commas, or define it as a list.
+  # Examples:
+  # watchNamespace: ns1,ns2
+  # watchNamespace: [ns1, ns2]
   watchNamespace:
 
   metricsBindAddress: 127.0.0.1:8080
diff --git a/docs/userguide/main.md b/docs/userguide/main.md
index 1a5635fb..b82a1adc 100644
--- a/docs/userguide/main.md
+++ b/docs/userguide/main.md
@@ -92,6 +92,10 @@ manager:
   loglevel: info
 
   # If specified, the operator will be restricted to watch objects only in the desired namespace. Defaults is to watch all namespaces.
+  # To watch multiple namespaces, either separate their name via commas or define it as a list.
+  # Examples:
+  # watchNamespaces: 'ns1,ns2'
+  # watchNamespace: [ns1, ns2]
   watchNamespace:
 
   # Configure extra environment variables for the operator. You can also pull them from secrets or configmaps
diff --git a/opensearch-operator/main.go b/opensearch-operator/main.go
index 68bffcf2..7a5a9834 100644
--- a/opensearch-operator/main.go
+++ b/opensearch-operator/main.go
@@ -22,7 +22,10 @@ import (
 	"os"
 	"strconv"
 
+	"strings"
+
 	"github.com/Opster/opensearch-k8s-operator/opensearch-operator/pkg/helpers"
+
 	"sigs.k8s.io/controller-runtime/pkg/cache"
 	metricsserver "sigs.k8s.io/controller-runtime/pkg/metrics/server"
 	"sigs.k8s.io/controller-runtime/pkg/webhook"
@@ -71,7 +74,7 @@ func main() {
 		"Enable leader election for controller manager. "+
 			"Enabling this will ensure there is only one active controller manager.")
 	flag.StringVar(&watchNamespace, "watch-namespace", "",
-		"The namespace that controller manager is restricted to watch. If not set, default is to watch all namespaces.")
+		"The comma-separated list of namespaces that the controller manager is restricted to watch. If not set, default is to watch all namespaces.")
 	flag.StringVar(&logLevel, "loglevel", "info", "The log level to use for the operator logs. Possible values: debug,info,warn,error")
 
 	opts := zap.Options{
@@ -94,6 +97,9 @@ func main() {
 		cacheOpts.DefaultNamespaces = map[string]cache.Config{
 			watchNamespace: {},
 		}
+		for watchNs := range strings.SplitSeq(watchNamespace, ",") {
+			cacheOpts.DefaultNamespaces[watchNs] = cache.Config{}
+		}
 	}
 
 	level, err := zapcore.ParseLevel(logLevel)