diff --git a/tests/e2e-auth-tests/cypress/e2e/apps/NonOrgMemberCannotDeleteApp.cy.ts b/tests/e2e-auth-tests/cypress/e2e/apps/NonOrgMemberCannotDeleteApp.cy.ts
new file mode 100644
index 00000000..961b2683
--- /dev/null
+++ b/tests/e2e-auth-tests/cypress/e2e/apps/NonOrgMemberCannotDeleteApp.cy.ts
@@ -0,0 +1,87 @@
+// Verifies that DELETE /api/apps/:app_id returns 403 when the authenticated
+// caller is neither a global admin nor a member of the app's owner
+// organization. This guards the authorization branch in
+// auth-server/src/app/api/apps/[app_id]/DELETE_app_handler.ts that returns
+// "Only organization owners or global admins can delete apps" (the
+// isUserInOrganizationWithRole(..., "owner") check).
+//
+// The unauthenticated (401) case is covered by
+// misc/UnauthenticatedApiRequests.cy.ts, and the hardcoded-app protection is
+// covered by resource_management/HardcodedResourceDeletionProtection.cy.ts.
+// The authenticated-non-owner branch — by far the most common authorization
+// path a real caller would hit — had no E2E coverage before this test.
+
+interface AppMutationResponseBody {
+  success: boolean;
+  message?: string;
+}
+
+describe("DELETE /api/apps/:app_id for non-org-member, non-admin user", () => {
+  it("returns 403 when the caller is not a member of the app's owner organization", () => {
+    cy.create_and_login_as_superuser_via_request().then(
+      (adminLoggedIn: boolean) => {
+        expect(adminLoggedIn, "superuser login should succeed").to.be.true;
+
+        cy.generate_random_code(12).then((randomCode: string) => {
+          const lowerCode = randomCode.toLowerCase();
+          const organization_id = `app-del-auth-${lowerCode}`;
+          const name = `App Delete Auth Org ${randomCode}`;
+
+          cy.create_organization_via_request({ organization_id, name }).then(
+            () => {
+              const app_name = `App Delete Auth ${randomCode}`;
+              const app_description = `App for delete-authorization E2E test ${randomCode}`;
+
+              cy.create_app({
+                app_name,
+                app_description,
+                organization_id,
+              }).then((createResult) => {
+                if (!createResult.success || !createResult.app_id) {
+                  throw new Error(
+                    `Failed to create test app for org '${organization_id}'`,
+                  );
+                }
+                const app_id: string = createResult.app_id;
+
+                cy.logout().then(() => {
+                  cy.generate_random_test_user_credentials().then(
+                    (credentials) => {
+                      cy.create_and_login_as_regular_user_via_request(
+                        credentials,
+                      ).then((regularLoggedIn: boolean) => {
+                        expect(
+                          regularLoggedIn,
+                          "regular user login should succeed",
+                        ).to.be.true;
+
+                        cy.request<AppMutationResponseBody>({
+                          method: "DELETE",
+                          url: `/api/apps/${app_id}`,
+                          failOnStatusCode: false,
+                        }).then((response) => {
+                          expect(
+                            response.status,
+                            "non-org-member DELETE should return 403",
+                          ).to.equal(403);
+                          expect(response.body).to.have.property(
+                            "success",
+                            false,
+                          );
+                          expect(
+                            String(response.body.message ?? "").toLowerCase(),
+                            "message should explain owner/admin requirement",
+                          ).to.include("owner");
+                        });
+                      });
+                    },
+                  );
+                });
+              });
+            },
+          );
+        });
+      },
+    );
+  });
+});
diff --git a/tests/e2e-auth-tests/package.json b/tests/e2e-auth-tests/package.json
index 25efee5f..5a74db32 100644
--- a/tests/e2e-auth-tests/package.json
+++ b/tests/e2e-auth-tests/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@schemavaults/e2e-auth-tests",
-  "version": "0.4.4",
+  "version": "0.4.5",
   "repository": {
     "type": "git",
     "url": "git+https://github.com/schemavaults/auth.git",