diff --git a/notifiers/notificationcenter.js b/notifiers/notificationcenter.js
index 87ce072..28b12d9 100644
--- a/notifiers/notificationcenter.js
+++ b/notifiers/notificationcenter.js
@@ -21,12 +21,23 @@ function NotificationCenter(options) {
     return new NotificationCenter(options);
   }
   this.options = options;
+  this.notifications = [];
 
   EventEmitter.call(this);
 }
 util.inherits(NotificationCenter, EventEmitter);
 var activeId = null;
 
+/**
+ * Call this to cancel timeouts on current notifications
+ */
+NotificationCenter.prototype.clearAll = function() {
+  for (var i in this.notifications) {
+    this.notifications[i].kill();
+  }
+  this.notifications = [];
+};
+
 function noop() {}
 NotificationCenter.prototype.notify = function(options, callback) {
   var fallbackNotifier;
@@ -75,11 +86,19 @@ NotificationCenter.prototype.notify = function(options, callback) {
 
   var argsList = utils.constructArgumentList(options);
   if (utils.isMountainLion()) {
-    utils.fileCommandJson(
+    // This will be the index of the newly added notification once its been
+    // added
+    var index = this.notifications.length;
+    var p = utils.fileCommandJson(
       this.options.customPath || notifier,
       argsList,
-      actionJackedCallback
+      function(e, data) {
+        // delete the notification since its been cleared
+        this.notifications.splice(index, 1);
+        actionJackedCallback(e, data);
+      }.bind(this)
     );
+    this.notifications.push(p);
     return this;
   }
 
diff --git a/test/terminal-notifier.js b/test/terminal-notifier.js
index 17a1f2c..6474277 100644
--- a/test/terminal-notifier.js
+++ b/test/terminal-notifier.js
@@ -308,4 +308,42 @@ describe('terminal-notifier', function() {
       });
     });
   });
+
+  describe('#clearAll()', function() {
+    var mockProcess = {
+      kill: jest.fn()
+    };
+    beforeEach(function() {
+      // reset mock for each test
+      mockProcess.kill = jest.fn();
+      utils.fileCommandJson = function() {
+        return mockProcess;
+      };
+    });
+
+    afterEach(function() {
+      utils.fileCommandJson = originalUtils;
+    });
+
+    it('should kill all terminal-notifier processes', function() {
+      notifier.notify({ message: 'Hello World' }, function() {});
+      notifier.clearAll();
+      expect(mockProcess.kill.mock.calls.length).toBe(1);
+    });
+
+    it('should not kill finished terminal-notifier processes', function(done) {
+      utils.fileCommandJson = function(n, o, cb) {
+        setTimeout(function() {
+          cb(null, '');
+          // After the callback the notification will be cleared.
+          // Calling `clearAll` should be a no-op
+          notifier.clearAll();
+          expect(mockProcess.kill.mock.calls.length).toBe(0);
+          done();
+        }, 0);
+        return mockProcess;
+      };
+      notifier.notify({ message: 'Hello World' }, function() {});
+    });
+  });
 });