diff --git a/deploy/crds/common/monitoring.rhobs_monitoringstacks.yaml b/deploy/crds/common/monitoring.rhobs_monitoringstacks.yaml
index b7ceebdff..db70266f3 100644
--- a/deploy/crds/common/monitoring.rhobs_monitoringstacks.yaml
+++ b/deploy/crds/common/monitoring.rhobs_monitoringstacks.yaml
@@ -48,6 +48,11 @@ spec:
               prometheusConfig:
                 description: Define prometheus config
                 properties:
+                  externalLabels:
+                    additionalProperties:
+                      type: string
+                    description: Define ExternalLabels for prometheus
+                    type: object
                   persistentVolumeClaim:
                     description: Define persistent volume claim for prometheus
                     properties:
diff --git a/docs/api.md b/docs/api.md
index a3d63dcea..54ba152df 100644
--- a/docs/api.md
+++ b/docs/api.md
@@ -148,6 +148,13 @@ Define prometheus config
         </tr>
     </thead>
     <tbody><tr>
+        <td><b>externalLabels</b></td>
+        <td>map[string]string</td>
+        <td>
+          Define ExternalLabels for prometheus<br/>
+        </td>
+        <td>false</td>
+      </tr><tr>
         <td><b><a href="#monitoringstackspecprometheusconfigpersistentvolumeclaim">persistentVolumeClaim</a></b></td>
         <td>object</td>
         <td>
diff --git a/pkg/apis/v1alpha1/types.go b/pkg/apis/v1alpha1/types.go
index b6fbbe4e8..1ffbb71ae 100644
--- a/pkg/apis/v1alpha1/types.go
+++ b/pkg/apis/v1alpha1/types.go
@@ -88,6 +88,9 @@ type PrometheusConfig struct {
 	// Define persistent volume claim for prometheus
 	// +optional
 	PersistentVolumeClaim *corev1.PersistentVolumeClaimSpec `json:"persistentVolumeClaim,omitempty"`
+	// Define ExternalLabels for prometheus
+	// +optional
+	ExternalLabels map[string]string `json:"externalLabels,omitempty"`
 }
 
 // NamespaceSelector is a selector for selecting either all namespaces or a
diff --git a/pkg/apis/v1alpha1/zz_generated.deepcopy.go b/pkg/apis/v1alpha1/zz_generated.deepcopy.go
index a7628403a..be10fabd8 100644
--- a/pkg/apis/v1alpha1/zz_generated.deepcopy.go
+++ b/pkg/apis/v1alpha1/zz_generated.deepcopy.go
@@ -163,6 +163,13 @@ func (in *PrometheusConfig) DeepCopyInto(out *PrometheusConfig) {
 		*out = new(corev1.PersistentVolumeClaimSpec)
 		(*in).DeepCopyInto(*out)
 	}
+	if in.ExternalLabels != nil {
+		in, out := &in.ExternalLabels, &out.ExternalLabels
+		*out = make(map[string]string, len(*in))
+		for key, val := range *in {
+			(*out)[key] = val
+		}
+	}
 }
 
 // DeepCopy is an autogenerated deepcopy function, copying the receiver, creating a new PrometheusConfig.
diff --git a/pkg/controllers/monitoring-stack/components.go b/pkg/controllers/monitoring-stack/components.go
index 1c41d32c0..12dbac53d 100644
--- a/pkg/controllers/monitoring-stack/components.go
+++ b/pkg/controllers/monitoring-stack/components.go
@@ -489,8 +489,9 @@ func newPrometheus(
 				BaseImage: stringPtr("quay.io/thanos/thanos"),
 				Version:   stringPtr("v0.24.0"),
 			},
-			Storage:     storageForPVC(config.PersistentVolumeClaim),
-			RemoteWrite: config.RemoteWrite,
+			Storage:        storageForPVC(config.PersistentVolumeClaim),
+			RemoteWrite:    config.RemoteWrite,
+			ExternalLabels: config.ExternalLabels,
 		},
 	}