diff --git a/.changeset/tiny-games-hide.md b/.changeset/tiny-games-hide.md
new file mode 100644
index 0000000000..2687174060
--- /dev/null
+++ b/.changeset/tiny-games-hide.md
@@ -0,0 +1,5 @@
+---
+'@backstage/catalog-client': patch
+---
+
+Make sure the `CatalogClient` escapes URL parameters correctly.
diff --git a/packages/catalog-client/src/CatalogClient.ts b/packages/catalog-client/src/CatalogClient.ts
index 7426aabaac..3de25e9808 100644
--- a/packages/catalog-client/src/CatalogClient.ts
+++ b/packages/catalog-client/src/CatalogClient.ts
@@ -42,10 +42,14 @@ export class CatalogClient implements CatalogApi {
   }
 
   async getLocationById(
-    id: String,
+    id: string,
     options?: CatalogRequestOptions,
   ): Promise<Location | undefined> {
-    return await this.requestOptional('GET', `/locations/${id}`, options);
+    return await this.requestOptional(
+      'GET',
+      `/locations/${encodeURIComponent(id)}`,
+      options,
+    );
   }
 
   async getEntities(
@@ -86,7 +90,9 @@ export class CatalogClient implements CatalogApi {
     const { kind, namespace = 'default', name } = compoundName;
     return this.requestOptional(
       'GET',
-      `/entities/by-name/${kind}/${namespace}/${name}`,
+      `/entities/by-name/${encodeURIComponent(kind)}/${encodeURIComponent(
+        namespace,
+      )}/${encodeURIComponent(name)}`,
       options,
     );
   }
@@ -171,14 +177,22 @@ export class CatalogClient implements CatalogApi {
     id: string,
     options?: CatalogRequestOptions,
   ): Promise<void> {
-    await this.requestIgnored('DELETE', `/locations/${id}`, options);
+    await this.requestIgnored(
+      'DELETE',
+      `/locations/${encodeURIComponent(id)}`,
+      options,
+    );
   }
 
   async removeEntityByUid(
     uid: string,
     options?: CatalogRequestOptions,
   ): Promise<void> {
-    await this.requestIgnored('DELETE', `/entities/by-uid/${uid}`, options);
+    await this.requestIgnored(
+      'DELETE',
+      `/entities/by-uid/${encodeURIComponent(uid)}`,
+      options,
+    );
   }
 
   //
diff --git a/packages/catalog-client/src/types.ts b/packages/catalog-client/src/types.ts
index 04cbb2b689..0d25bf7483 100644
--- a/packages/catalog-client/src/types.ts
+++ b/packages/catalog-client/src/types.ts
@@ -46,7 +46,7 @@ export interface CatalogApi {
 
   // Locations
   getLocationById(
-    id: String,
+    id: string,
     options?: CatalogRequestOptions,
   ): Promise<Location | undefined>;
   getOriginLocationByEntity(
diff --git a/plugins/catalog/src/CatalogClientWrapper.ts b/plugins/catalog/src/CatalogClientWrapper.ts
index 32dff8a0a1..4966d9c13f 100644
--- a/plugins/catalog/src/CatalogClientWrapper.ts
+++ b/plugins/catalog/src/CatalogClientWrapper.ts
@@ -42,7 +42,7 @@ export class CatalogClientWrapper implements CatalogApi {
   }
 
   async getLocationById(
-    id: String,
+    id: string,
     options?: CatalogRequestOptions,
   ): Promise<Location | undefined> {
     return await this.client.getLocationById(id, {