diff --git a/lib/common/util.js b/lib/common/util.js
index 84a4f0d73cb..f454afc3f21 100644
--- a/lib/common/util.js
+++ b/lib/common/util.js
@@ -124,7 +124,7 @@ util.arrayize = arrayize;
  */
 function format(template, args) {
   return template.replace(/{([^}]*)}/g, function(match, key) {
-    return args[key] || match;
+    return key in args ? args[key] : match;
   });
 }
 
diff --git a/lib/pubsub/index.js b/lib/pubsub/index.js
index 0f15df8e8e5..58faa8072c2 100644
--- a/lib/pubsub/index.js
+++ b/lib/pubsub/index.js
@@ -162,6 +162,124 @@ PubSub.prototype.createTopic = function(name, callback) {
   });
 };
 
+/**
+ * Create a subscription to this topic. You may optionally provide an object to
+ * customize the subscription.
+ *
+ * Your provided callback will either be invoked with an error object, if an API
+ * error occurred, or a {@linkcode module:pubsub/subscription} object.
+ *
+ * @throws {Error} If a name is not provided.
+ *
+ * @param {string} name - The name of the subscription.
+ * @param {object=} options - Configuration object.
+ * @param {number=} options.ackDeadlineSeconds - The maximum time after
+ *     receiving a message that you must ack a message before it is redelivered.
+ * @param {boolean=} options.autoAck - Automatically acknowledge the message
+ *     once it's pulled. (default: false)
+ * @param {number=} options.interval - Interval in milliseconds to check for new
+ *     messages. (default: 10)
+ * @param {string=} options.projectId - The projectId where the topic resource
+ *     exists.
+ * @param {boolean=} options.reuseExisting - If the subscription already exists,
+ *     reuse it. The options of the existing subscription are not changed. If
+ *     false, attempting to create a subscription that already exists will fail.
+ *     (default: false)
+ * @param {function} callback - The callback function.
+ *
+ * @example
+ * // Without specifying any options.
+ * var topic = 'messageTopic';
+ * var sub = 'messageSubscription';
+ *
+ * pubsub.subscribe(topic, sub, function(err, subscription, apiResponse) {});
+ *
+ * // With options.
+ * pubsub.subscribe(topic, sub, {
+ *   ackDeadlineSeconds: 90,
+ *   autoAck: true,
+ *   interval: 30
+ * }, function(err, subscription, apiResponse) {});
+ */
+PubSub.prototype.subscribe = function(topicName, subName, options, callback) {
+  var self = this;
+
+  if (!topicName) {
+    throw new Error('A Topic name is required for a new subscription.');
+  }
+
+  if (!subName) {
+    throw new Error('A Subscription name is required for a new subscription.');
+  }
+
+  if (!callback) {
+    callback = options;
+    options = {};
+  }
+
+  var body = {
+    topic: topicName
+  };
+
+  if (options.ackDeadlineSeconds) {
+    body.ackDeadlineSeconds = options.ackDeadlineSeconds;
+  }
+
+  var projectId = options.projectId || this.projectId;
+
+  var path = Subscription.formatName_(projectId, subName);
+
+  this.makeReq_('PUT', path, null, body, function(err, result) {
+    if (options.reuseExisting && err && err.code === 409) {
+      callback(null, self.subscription(subName, options), result);
+    } else if (err) {
+      callback(err, null, result);
+    } else {
+      callback(null, self.subscription(subName, options), result);
+    }
+  });
+};
+
+/**
+ * Create a Subscription object in reference to an existing subscription. This
+ * command by itself will not run any API requests. You will receive a
+ * {@linkcode module:pubsub/subscription} object, which will allow you to
+ * interact with your subscription.
+ *
+ * @throws {Error} If a name is not provided.
+ *
+ * @param {string} name - The name of the subscription.
+ * @param {object=} options - Configuration object.
+ * @param {boolean=} options.autoAck - Automatically acknowledge the message
+ *     once it's pulled.
+ * @param {number=} options.interval - Interval in milliseconds to check for new
+ *     messages.
+ * @param {string=} options.projectId - The projectId where the subscription
+ *     exists.
+ * @return {module:pubsub/subscription}
+ *
+ * @example
+ * var subscription = pubsub.subscription('my-existing-subscription');
+ *
+ * // Register a listener for `message` events.
+ * subscription.on('message', function(message) {
+ *   // Called every time a message is received.
+ *   // message.id = ID used to acknowledge its receival.
+ *   // message.data = Contents of the message.
+ *   // message.attributes = Attributes of the message.
+ * });
+ */
+PubSub.prototype.subscription = function(name, options) {
+  if (!name) {
+    throw new Error('The name of a subscription is required.');
+  }
+
+  options = options || {};
+  options.name = name;
+
+  return new Subscription(this, options);
+};
+
 /**
  * Create a Topic object to reference an existing topic.
  *
@@ -195,9 +313,13 @@ PubSub.prototype.topic = function(name, options) {
  * You may optionally provide a query object as the first argument to customize
  * the response.
  *
- * @param {object=} query - Query object.
- * @param {string=} query.pageToken - Page token.
- * @param {number=} query.pageSize - Maximum number of results to return.
+ * @param {object=} options - Query object.
+ * @param {string=} options.projectId - The projectId where the topic
+ *     resource exists.
+ * @param {string=} options.topic - The name of the topic to list subscriptions
+ *     from.
+ * @param {number=} options.pageSize - Maximum number of results to return.
+ * @param {string=} options.pageToken - Page token.
  * @param {function} callback - The callback function.
  *
  * @example
@@ -214,30 +336,58 @@ PubSub.prototype.topic = function(name, options) {
  *   pageSize: 10
  * }, callback);
  */
-PubSub.prototype.getSubscriptions = function(query, callback) {
+PubSub.prototype.getSubscriptions = function(options, callback) {
   var self = this;
+
   if (!callback) {
-    callback = query;
-    query = {};
+    callback = options;
+    options = {};
   }
 
-  var path = this.projectName + '/subscriptions';
-  this.makeReq_('GET', path, query, true, function(err, result) {
+  options = options || {};
+
+  var query = {};
+
+  if (options.pageSize) {
+    query.pageSize = options.pageSize;
+  }
+
+  if (options.pageToken) {
+    query.pageToken = options.pageToken;
+  }
+
+  var projectId = options.projectId || this.projectId;
+
+  var apiPath = util.format('{projectPath}{topicPath}/subscriptions', {
+    projectPath: 'projects/' + projectId,
+    topicPath: options.topic ? '/topics/' + options.topic : ''
+  });
+
+  this.makeReq_('GET', apiPath, query, null, function(err, result) {
     if (err) {
       callback(err, null, null, result);
       return;
     }
 
-    var subscriptions = (result.subscriptions || []).map(function(item) {
+    var subscriptions = (result.subscriptions || []).map(function(sub) {
+      // Depending on if we're using a subscriptions.list or
+      // topics.subscriptions.list API endpoint, we will get back a Subscription
+      // resource or just the name of the subscription.
+      var subName = sub.name || sub;
+
       return new Subscription(self, {
-        name: item.name
+        projectId: projectId,
+        name: subName
       });
     });
+
     var nextQuery = null;
+
     if (result.nextPageToken) {
-      nextQuery = query;
+      nextQuery = options;
       nextQuery.pageToken = result.nextPageToken;
     }
+
     callback(null, subscriptions, nextQuery, result);
   });
 };
diff --git a/lib/pubsub/subscription.js b/lib/pubsub/subscription.js
index 0c91730a584..e87e3077edc 100644
--- a/lib/pubsub/subscription.js
+++ b/lib/pubsub/subscription.js
@@ -114,7 +114,10 @@ var util = require('../common/util.js');
 function Subscription(pubsub, options) {
   events.EventEmitter.call(this);
 
-  this.name = Subscription.formatName_(pubsub.projectId, options.name);
+  var projectId = options.projectId || pubsub.projectId;
+
+  this.name = Subscription.formatName_(projectId, options.name);
+
   this.makeReq_ = pubsub.makeReq_.bind(pubsub);
 
   this.autoAck = util.is(options.autoAck, 'boolean') ? options.autoAck : false;
diff --git a/lib/pubsub/topic.js b/lib/pubsub/topic.js
index ee913b23b4d..a6289b23fb5 100644
--- a/lib/pubsub/topic.js
+++ b/lib/pubsub/topic.js
@@ -26,12 +26,6 @@
  */
 var util = require('../common/util.js');
 
-/**
- * @type {module:pubsub/subscription}
- * @private
- */
-var Subscription = require('./subscription.js');
-
 /*! Developer Documentation
  *
  * @param {module:pubsub} pubsub - PubSub object.
@@ -60,9 +54,9 @@ function Topic(pubsub, options) {
   this.name = Topic.formatName_(pubsub.projectId, options.name);
   this.projectId = pubsub.projectId;
   this.pubsub = pubsub;
+  this.unformattedName = options.name;
 
   if (options.autoCreate) {
-    this.unformattedName = options.name;
     this.origMakeReq_ = this.makeReq_;
     this.makeReq_ = this.autoCreateWrapper_;
   }
@@ -220,9 +214,9 @@ Topic.prototype.delete = function(callback) {
  * error occurred, or an array of {@linkcode module:pubsub/subscription}
  * objects.
  *
- * @param {object=} query - Query object.
- * @param {string=} query.pageToken - Page token.
- * @param {number=} query.pageSize - Maximum number of results to return.
+ * @param {object=} options - Configuration object.
+ * @param {number=} options.pageSize - Maximum number of results to return.
+ * @param {string=} options.pageToken - Page token.
  * @param {function} callback - The callback function.
  *
  * @example
@@ -237,32 +231,16 @@ Topic.prototype.delete = function(callback) {
  *   pageSize: 3
  * }, function(err, subscriptions, nextQuery, apiResponse) {});
  */
-Topic.prototype.getSubscriptions = function(query, callback) {
-  var self = this;
-  if (util.is(query, 'function')) {
-    callback = query;
-    query = {};
+Topic.prototype.getSubscriptions = function(options, callback) {
+  if (!callback) {
+    callback = options;
+    options = {};
   }
 
-  var path = this.name + '/subscriptions';
-  this.makeReq_('GET', path, query, true, function(err, result) {
-    if (err) {
-      callback(err, null, null, result);
-      return;
-    }
+  options.projectId = this.pubsub.projectId;
+  options.topic = this.unformattedName;
 
-    var subscriptions = (result.subscriptions || []).map(function(name) {
-      return new Subscription(self, {
-        name: name
-      });
-    });
-    var nextQuery = null;
-    if (result.nextPageToken) {
-      nextQuery = query;
-      nextQuery.pageToken = result.nextPageToken;
-    }
-    callback(null, subscriptions, nextQuery, result);
-  });
+  this.pubsub.getSubscriptions(options, callback);
 };
 
 /**
@@ -300,34 +278,17 @@ Topic.prototype.getSubscriptions = function(query, callback) {
  * }, function(err, subscription, apiResponse) {});
  */
 Topic.prototype.subscribe = function(name, options, callback) {
-  var self = this;
-  if (!name) {
-    throw new Error('A name is required for a new subscription.');
-  }
   if (!callback) {
     callback = options;
     options = {};
   }
 
-  var body = {
-    topic: this.name
-  };
-
-  if (options.ackDeadlineSeconds) {
-    body.ackDeadlineSeconds = options.ackDeadlineSeconds;
-  }
+  var topicName = this.name;
 
-  var path = Subscription.formatName_(this.projectId, name);
+  options = options || {};
+  options.projectId = this.pubsub.projectId;
 
-  this.makeReq_('PUT', path, null, body, function(err, result) {
-    if (options.reuseExisting && err && err.code === 409) {
-      callback(null, self.subscription(name, options), result);
-    } else if (err) {
-      callback(err, null, result);
-    } else {
-      callback(null, self.subscription(name, options), result);
-    }
-  });
+  return this.pubsub.subscribe(topicName, name, options, callback);
 };
 
 /**
@@ -358,12 +319,9 @@ Topic.prototype.subscribe = function(name, options, callback) {
  * });
  */
 Topic.prototype.subscription = function(name, options) {
-  if (!name) {
-    throw new Error('The name of a subscription is required.');
-  }
   options = options || {};
-  options.name = name;
-  return new Subscription(this.pubsub, options);
+  options.projectId = this.pubsub.projectId;
+  return this.pubsub.subscription(name, options);
 };
 
 module.exports = Topic;