diff --git a/apis/dscinitialization/v1/dscinitialization_types.go b/apis/dscinitialization/v1/dscinitialization_types.go
index e9598e89743..d4d500689e7 100644
--- a/apis/dscinitialization/v1/dscinitialization_types.go
+++ b/apis/dscinitialization/v1/dscinitialization_types.go
@@ -34,6 +34,8 @@ type DSCInitializationSpec struct {
 	// +kubebuilder:default:=opendatahub
 	// +kubebuilder:validation:XValidation:rule="self == oldSelf",message="ApplicationsNamespace is immutable"
 	// +operator-sdk:csv:customresourcedefinitions:type=spec,order=1
+	// +kubebuilder:validation:Pattern="^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$"
+	// +kubebuilder:validation:MaxLength=63
 	ApplicationsNamespace string `json:"applicationsNamespace"`
 	// Enable monitoring on specified namespace
 	// +operator-sdk:csv:customresourcedefinitions:type=spec,order=2
@@ -68,8 +70,10 @@ type Monitoring struct {
 	//               or if it is installed, the operator will try to remove it.
 	// +kubebuilder:validation:Enum=Managed;Removed
 	ManagementState operatorv1.ManagementState `json:"managementState,omitempty"`
-	// +kubebuilder:default=opendatahub
 	// Namespace for monitoring if it is enabled
+	// +kubebuilder:default=opendatahub
+	// +kubebuilder:validation:Pattern="^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$"
+	// +kubebuilder:validation:MaxLength=63
 	Namespace string `json:"namespace,omitempty"`
 }
 
diff --git a/bundle/manifests/dscinitialization.opendatahub.io_dscinitializations.yaml b/bundle/manifests/dscinitialization.opendatahub.io_dscinitializations.yaml
index 5cb7b2a2d2f..950759b5b85 100644
--- a/bundle/manifests/dscinitialization.opendatahub.io_dscinitializations.yaml
+++ b/bundle/manifests/dscinitialization.opendatahub.io_dscinitializations.yaml
@@ -56,6 +56,8 @@ spec:
                 default: opendatahub
                 description: Namespace for applications to be installed, non-configurable,
                   default to "opendatahub"
+                maxLength: 63
+                pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$
                 type: string
                 x-kubernetes-validations:
                 - message: ApplicationsNamespace is immutable
@@ -95,6 +97,8 @@ spec:
                   namespace:
                     default: opendatahub
                     description: Namespace for monitoring if it is enabled
+                    maxLength: 63
+                    pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$
                     type: string
                 type: object
               serviceMesh:
diff --git a/config/crd/bases/dscinitialization.opendatahub.io_dscinitializations.yaml b/config/crd/bases/dscinitialization.opendatahub.io_dscinitializations.yaml
index edacd9cf82e..d9effb71fd7 100644
--- a/config/crd/bases/dscinitialization.opendatahub.io_dscinitializations.yaml
+++ b/config/crd/bases/dscinitialization.opendatahub.io_dscinitializations.yaml
@@ -56,6 +56,8 @@ spec:
                 default: opendatahub
                 description: Namespace for applications to be installed, non-configurable,
                   default to "opendatahub"
+                maxLength: 63
+                pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$
                 type: string
                 x-kubernetes-validations:
                 - message: ApplicationsNamespace is immutable
@@ -95,6 +97,8 @@ spec:
                   namespace:
                     default: opendatahub
                     description: Namespace for monitoring if it is enabled
+                    maxLength: 63
+                    pattern: ^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$
                     type: string
                 type: object
               serviceMesh:
diff --git a/docs/api-overview.md b/docs/api-overview.md
index 0f0f7030595..65209a6206e 100644
--- a/docs/api-overview.md
+++ b/docs/api-overview.md
@@ -627,7 +627,7 @@ _Appears in:_
 
 | Field | Description | Default | Validation |
 | --- | --- | --- | --- |
-| `applicationsNamespace` _string_ | Namespace for applications to be installed, non-configurable, default to "opendatahub" | opendatahub |  |
+| `applicationsNamespace` _string_ | Namespace for applications to be installed, non-configurable, default to "opendatahub" | opendatahub | MaxLength: 63 <br />Pattern: `^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$` <br /> |
 | `monitoring` _[Monitoring](#monitoring)_ | Enable monitoring on specified namespace |  |  |
 | `serviceMesh` _[ServiceMeshSpec](#servicemeshspec)_ | Configures Service Mesh as networking layer for Data Science Clusters components.<br />The Service Mesh is a mandatory prerequisite for single model serving (KServe) and<br />you should review this configuration if you are planning to use KServe.<br />For other components, it enhances user experience; e.g. it provides unified<br />authentication giving a Single Sign On experience. |  |  |
 | `trustedCABundle` _[TrustedCABundleSpec](#trustedcabundlespec)_ | When set to `Managed`, adds odh-trusted-ca-bundle Configmap to all namespaces that includes<br />cluster-wide Trusted CA Bundle in .data["ca-bundle.crt"].<br />Additionally, this fields allows admins to add custom CA bundles to the configmap using the .CustomCABundle field. |  |  |
@@ -686,7 +686,7 @@ _Appears in:_
 | Field | Description | Default | Validation |
 | --- | --- | --- | --- |
 | `managementState` _[ManagementState](#managementstate)_ | Set to one of the following values:<br />- "Managed" : the operator is actively managing the component and trying to keep it active.<br />              It will only upgrade the component if it is safe to do so.<br />- "Removed" : the operator is actively managing the component and will not install it,<br />              or if it is installed, the operator will try to remove it. |  | Enum: [Managed Removed] <br /> |
-| `namespace` _string_ | Namespace for monitoring if it is enabled | opendatahub |  |
+| `namespace` _string_ | Namespace for monitoring if it is enabled | opendatahub | MaxLength: 63 <br />Pattern: `^([a-z0-9]([-a-z0-9]*[a-z0-9])?)?$` <br /> |
 
 
 #### TrustedCABundleSpec