diff --git a/src/core/public/saved_objects/saved_objects_client.ts b/src/core/public/saved_objects/saved_objects_client.ts
index f415e9c58596..ce3ebc710ed1 100644
--- a/src/core/public/saved_objects/saved_objects_client.ts
+++ b/src/core/public/saved_objects/saved_objects_client.ts
@@ -65,7 +65,7 @@ export interface SavedObjectsCreateOptions {
   /** {@inheritDoc SavedObjectsMigrationVersion} */
   migrationVersion?: SavedObjectsMigrationVersion;
   references?: SavedObjectReference[];
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 
 /**
@@ -83,7 +83,7 @@ export interface SavedObjectsBulkCreateObject<T = unknown> extends SavedObjectsC
 export interface SavedObjectsBulkCreateOptions {
   /** If a document with the given `id` already exists, overwrite it's contents (default=false). */
   overwrite?: boolean;
-  workspaces?: string[];
+  workspaces?: SavedObjectsCreateOptions['workspaces'];
 }
 
 /** @public */
diff --git a/src/core/server/saved_objects/export/get_sorted_objects_for_export.ts b/src/core/server/saved_objects/export/get_sorted_objects_for_export.ts
index 0336fc702973..6c99db6c24af 100644
--- a/src/core/server/saved_objects/export/get_sorted_objects_for_export.ts
+++ b/src/core/server/saved_objects/export/get_sorted_objects_for_export.ts
@@ -61,7 +61,7 @@ export interface SavedObjectsExportOptions {
   /** optional namespace to override the namespace used by the savedObjectsClient. */
   namespace?: string;
   /** optional workspaces to override the workspaces used by the savedObjectsClient. */
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 
 /**
@@ -97,7 +97,7 @@ async function fetchObjectsToExport({
   exportSizeLimit: number;
   savedObjectsClient: SavedObjectsClientContract;
   namespace?: string;
-  workspaces?: string[];
+  workspaces?: SavedObjectsExportOptions['workspaces'];
 }) {
   if ((types?.length ?? 0) > 0 && (objects?.length ?? 0) > 0) {
     throw Boom.badRequest(`Can't specify both "types" and "objects" properties when exporting`);
diff --git a/src/core/server/saved_objects/import/check_conflicts.ts b/src/core/server/saved_objects/import/check_conflicts.ts
index 2c35ba147c5d..d173af45f761 100644
--- a/src/core/server/saved_objects/import/check_conflicts.ts
+++ b/src/core/server/saved_objects/import/check_conflicts.ts
@@ -44,7 +44,7 @@ interface CheckConflictsParams {
   ignoreRegularConflicts?: boolean;
   retries?: SavedObjectsImportRetry[];
   createNewCopies?: boolean;
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 
 const isUnresolvableConflict = (error: SavedObjectError) =>
diff --git a/src/core/server/saved_objects/import/create_saved_objects.ts b/src/core/server/saved_objects/import/create_saved_objects.ts
index 6b0015851baf..f98e2e816b75 100644
--- a/src/core/server/saved_objects/import/create_saved_objects.ts
+++ b/src/core/server/saved_objects/import/create_saved_objects.ts
@@ -41,7 +41,7 @@ interface CreateSavedObjectsParams<T> {
   overwrite?: boolean;
   dataSourceId?: string;
   dataSourceTitle?: string;
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 interface CreateSavedObjectsResult<T> {
   createdObjects: Array<CreatedObject<T>>;
diff --git a/src/core/server/saved_objects/import/types.ts b/src/core/server/saved_objects/import/types.ts
index 994b7e627189..689b8222b510 100644
--- a/src/core/server/saved_objects/import/types.ts
+++ b/src/core/server/saved_objects/import/types.ts
@@ -190,7 +190,7 @@ export interface SavedObjectsImportOptions {
   dataSourceId?: string;
   dataSourceTitle?: string;
   /** if specified, will import in given workspaces */
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 
 /**
@@ -215,7 +215,7 @@ export interface SavedObjectsResolveImportErrorsOptions {
   dataSourceId?: string;
   dataSourceTitle?: string;
   /** if specified, will import in given workspaces */
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 
 export type CreatedObject<T> = SavedObject<T> & { destinationId?: string };
diff --git a/src/core/server/saved_objects/serialization/types.ts b/src/core/server/saved_objects/serialization/types.ts
index f882596ce529..6b1f025e856d 100644
--- a/src/core/server/saved_objects/serialization/types.ts
+++ b/src/core/server/saved_objects/serialization/types.ts
@@ -29,7 +29,7 @@
  */
 
 import { Permissions } from '../permission_control';
-import { SavedObjectsMigrationVersion, SavedObjectReference } from '../types';
+import { SavedObjectsMigrationVersion, SavedObjectReference, SavedObject } from '../types';
 
 /**
  * A raw document as represented directly in the saved object index.
@@ -53,7 +53,7 @@ export interface SavedObjectsRawDocSource {
   updated_at?: string;
   references?: SavedObjectReference[];
   originId?: string;
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 
   [typeMapping: string]: any;
 }
@@ -71,7 +71,7 @@ interface SavedObjectDoc<T = unknown> {
   version?: string;
   updated_at?: string;
   originId?: string;
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
   permissions?: Permissions;
 }
 
diff --git a/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts b/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts
index abbef0850dba..318768fd83c2 100644
--- a/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts
+++ b/src/core/server/saved_objects/service/lib/search_dsl/query_params.ts
@@ -167,7 +167,7 @@ interface QueryParams {
   defaultSearchOperator?: string;
   hasReference?: HasReferenceQueryParams;
   kueryNode?: KueryNode;
-  workspaces?: string[];
+  workspaces?: SavedObjectsFindOptions['workspaces'];
   workspacesSearchOperator?: 'AND' | 'OR';
   ACLSearchParams?: SavedObjectsFindOptions['ACLSearchParams'];
 }
diff --git a/src/core/server/saved_objects/service/lib/search_dsl/search_dsl.ts b/src/core/server/saved_objects/service/lib/search_dsl/search_dsl.ts
index fa4311576638..626fc7efba3e 100644
--- a/src/core/server/saved_objects/service/lib/search_dsl/search_dsl.ts
+++ b/src/core/server/saved_objects/service/lib/search_dsl/search_dsl.ts
@@ -53,7 +53,7 @@ interface GetSearchDslOptions {
     id: string;
   };
   kueryNode?: KueryNode;
-  workspaces?: string[];
+  workspaces?: SavedObjectsFindOptions['workspaces'];
   workspacesSearchOperator?: 'AND' | 'OR';
   ACLSearchParams?: SavedObjectsFindOptions['ACLSearchParams'];
 }
diff --git a/src/core/server/saved_objects/service/saved_objects_client.ts b/src/core/server/saved_objects/service/saved_objects_client.ts
index 1b268e033d97..be02ef247d04 100644
--- a/src/core/server/saved_objects/service/saved_objects_client.ts
+++ b/src/core/server/saved_objects/service/saved_objects_client.ts
@@ -97,7 +97,7 @@ export interface SavedObjectsBulkCreateObject<T = unknown> {
   /**
    * workspaces the objects belong to, will only be used when overwrite is enabled.
    */
-  workspaces?: string[];
+  workspaces?: SavedObject['workspaces'];
 }
 
 /**
diff --git a/src/core/server/saved_objects/types.ts b/src/core/server/saved_objects/types.ts
index 0b31baf5c111..22093b90d6b3 100644
--- a/src/core/server/saved_objects/types.ts
+++ b/src/core/server/saved_objects/types.ts
@@ -112,7 +112,7 @@ export interface SavedObjectsFindOptions {
   /** An optional OpenSearch preference value to be used for the query **/
   preference?: string;
   /** If specified, will only retrieve objects that are in the workspaces */
-  workspaces?: string[] | null;
+  workspaces?: SavedObjectsBaseOptions['workspaces'];
   /** By default the operator will be 'AND' */
   workspacesSearchOperator?: 'AND' | 'OR';
   /**
@@ -132,7 +132,7 @@ export interface SavedObjectsBaseOptions {
   /** Specify the namespace for this operation */
   namespace?: string;
   /** Specify the workspaces for this operation */
-  workspaces?: string[] | null;
+  workspaces?: SavedObject['workspaces'];
 }
 
 /**
diff --git a/src/core/types/saved_objects.ts b/src/core/types/saved_objects.ts
index b37309338c9e..e91a5012098e 100644
--- a/src/core/types/saved_objects.ts
+++ b/src/core/types/saved_objects.ts
@@ -115,7 +115,7 @@ export interface SavedObject<T = unknown> {
    */
   originId?: string;
   /** Workspaces that this saved object exists in. */
-  workspaces?: string[];
+  workspaces?: string[] | null;
   /** Permissions that this saved objects exists in. */
   permissions?: Permissions;
 }
diff --git a/src/plugins/workspace/server/permission_control/client.ts b/src/plugins/workspace/server/permission_control/client.ts
index bad46eb156a6..03a8fb0aaf3d 100644
--- a/src/plugins/workspace/server/permission_control/client.ts
+++ b/src/plugins/workspace/server/permission_control/client.ts
@@ -147,7 +147,7 @@ export class SavedObjectsPermissionControl {
     const principals = this.getPrincipalsFromRequest(request);
     const deniedObjects: Array<
       Pick<SavedObjectsBulkGetObject, 'id' | 'type'> & {
-        workspaces?: string[];
+        workspaces?: SavedObject['workspaces'];
         permissions?: Permissions;
       }
     > = [];