diff --git a/aio/tools/transforms/examples-package/processors/check-for-unused-example-regions.js b/aio/tools/transforms/examples-package/processors/check-for-unused-example-regions.js
new file mode 100644
index 0000000000..f94b4d78c7
--- /dev/null
+++ b/aio/tools/transforms/examples-package/processors/check-for-unused-example-regions.js
@@ -0,0 +1,38 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+/**
+ * A processor that will fail if there are named example regions that are not used in any docs.
+ *
+ * @param {*} exampleMap - contains all the regions extracted from example files.
+ */
+module.exports = function checkForUnusedExampleRegions(exampleMap) {
+  return {
+    $runAfter: ['renderExamples'],
+    $runBefore: ['writing-files'],
+    $process() {
+      const unusedExampleRegions = [];
+      for (const exampleFolder of Object.values(exampleMap)) {
+        for (const exampleFile of Object.values(exampleFolder)) {
+          for (const [regionName, region] of Object.entries(exampleFile.regions)) {
+            if (regionName === '' || region.usedInDoc) continue;
+            unusedExampleRegions.push(region);
+          }
+        }
+      }
+
+      if (unusedExampleRegions.length > 0) {
+        const message = (unusedExampleRegions.length === 1 ?
+                             'There is 1 unused example region:\n' :
+                             `There are ${unusedExampleRegions.length} unused example regions:\n`) +
+            unusedExampleRegions.map(region => ` - ${region.id}`).join('\n');
+        throw new Error(message);
+      }
+    },
+  };
+};
diff --git a/aio/tools/transforms/examples-package/processors/check-for-unused-example-regions.spec.js b/aio/tools/transforms/examples-package/processors/check-for-unused-example-regions.spec.js
new file mode 100644
index 0000000000..56021e38b2
--- /dev/null
+++ b/aio/tools/transforms/examples-package/processors/check-for-unused-example-regions.spec.js
@@ -0,0 +1,77 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+const testPackage = require('../../helpers/test-package');
+const Dgeni = require('dgeni');
+
+describe('checkForUnusedExampleRegions', () => {
+  var processor, exampleMap;
+
+  beforeEach(function() {
+    const dgeni = new Dgeni([testPackage('examples-package', true)]);
+    const injector = dgeni.configureInjector();
+    exampleMap = injector.get('exampleMap');
+    processor = injector.get('checkForUnusedExampleRegions');
+  });
+
+  describe('$process()', () => {
+    it('should error if there is a named example region which has not been used', () => {
+      exampleMap['examples'] = {
+        'some/file': {
+          regions: {
+            '': {id: 'some/file#'},
+            'used': {id: 'some/file#used', usedInDoc: {}},
+            'not-used': {id: 'some/file#not-used'},
+          }
+        }
+      };
+      expect(() => processor.$process())
+          .toThrowError('There is 1 unused example region:\n - some/file#not-used');
+    });
+
+    it('should not error if there are no example folders', () => {
+      expect(() => processor.$process()).not.toThrowError();
+    });
+
+    it('should not error if there are no example files', () => {
+      exampleMap['examples'] = {};
+      expect(() => processor.$process()).not.toThrowError();
+    });
+
+    it('should not error if there are no example regions', () => {
+      exampleMap['examples'] = {
+        'some/file': {
+          regions: {},
+        },
+      };
+      expect(() => processor.$process()).not.toThrowError();
+    });
+
+    it('should not error if there are no named example regions', () => {
+      exampleMap['examples'] = {
+        'some/file': {
+          regions: {
+            '': {id: 'some/file#'},
+          },
+        },
+      };
+      expect(() => processor.$process()).not.toThrowError();
+    });
+
+    it('should not error if there are no unused named example regions', () => {
+      exampleMap['examples'] = {
+        'some/file': {
+          regions: {
+            '': {id: 'some/file#'},
+            'used': {id: 'some/file#used', usedInDoc: {}},
+          }
+        }
+      };
+      expect(() => processor.$process()).not.toThrowError();
+    });
+  });
+});