diff --git a/Library/Homebrew/cask/lib/hbc/cask.rb b/Library/Homebrew/cask/lib/hbc/cask.rb
index 3f8da25b7f..cf5f2b37a9 100644
--- a/Library/Homebrew/cask/lib/hbc/cask.rb
+++ b/Library/Homebrew/cask/lib/hbc/cask.rb
@@ -89,6 +89,30 @@ module Hbc
       metadata_master_container_path.join(*installed_version, "Casks", "#{token}.rb")
     end
 
+    def outdated?(greedy = false)
+      !outdated_versions(greedy).empty?
+    end
+
+    def outdated_versions(greedy = false)
+      # special case: tap version is not available
+      return [] if version.nil?
+
+      if greedy
+        return versions if version.latest?
+      elsif auto_updates
+        return []
+      end
+
+      installed = versions
+      current   = installed.last
+
+      # not outdated unless there is a different version on tap
+      return [] if current == version
+
+      # collect all installed versions that are different than tap version and return them
+      installed.select { |v| v != version }
+    end
+
     def to_s
       @token
     end
diff --git a/Library/Homebrew/cask/lib/hbc/cli.rb b/Library/Homebrew/cask/lib/hbc/cli.rb
index 27bea06ef1..aa795fc590 100644
--- a/Library/Homebrew/cask/lib/hbc/cli.rb
+++ b/Library/Homebrew/cask/lib/hbc/cli.rb
@@ -15,6 +15,7 @@ require "hbc/cli/home"
 require "hbc/cli/info"
 require "hbc/cli/install"
 require "hbc/cli/list"
+require "hbc/cli/outdated"
 require "hbc/cli/reinstall"
 require "hbc/cli/search"
 require "hbc/cli/style"
diff --git a/Library/Homebrew/cask/lib/hbc/cli/outdated.rb b/Library/Homebrew/cask/lib/hbc/cli/outdated.rb
new file mode 100644
index 0000000000..d608beab50
--- /dev/null
+++ b/Library/Homebrew/cask/lib/hbc/cli/outdated.rb
@@ -0,0 +1,39 @@
+module Hbc
+  class CLI
+    class Outdated < Base
+      def self.run(*args)
+        greedy  = args.include?("--greedy")
+        verbose = ($stdout.tty? || CLI.verbose?) && !args.include?("--quiet")
+
+        cask_tokens = cask_tokens_from(args)
+        casks_to_check = if cask_tokens.empty?
+          Hbc.installed
+        else
+          cask_tokens.map { |token| Hbc.load(token) }
+        end
+
+        casks_to_check.each do |cask|
+          odebug "Checking update info of Cask #{cask}"
+          list_if_outdated(cask, greedy, verbose)
+        end
+      end
+
+      def self.list_if_outdated(cask, greedy, verbose)
+        return unless cask.outdated?(greedy)
+
+        if verbose
+          outdated_versions = cask.outdated_versions(greedy)
+          outdated_info   = "#{cask.token} (#{outdated_versions.join(", ")})"
+          current_version = cask.version.to_s
+          puts "#{outdated_info} != #{current_version}"
+        else
+          puts cask.token
+        end
+      end
+
+      def self.help
+        "list the outdated installed Casks"
+      end
+    end
+  end
+end
diff --git a/Library/Homebrew/manpages/brew-cask.1.md b/Library/Homebrew/manpages/brew-cask.1.md
index 56781bd769..41b04dbb70 100644
--- a/Library/Homebrew/manpages/brew-cask.1.md
+++ b/Library/Homebrew/manpages/brew-cask.1.md
@@ -85,6 +85,17 @@ names, and other aspects of this manual are still subject to change.
 
     If <token> is given, summarize the staged files associated with the
     given Cask.
+    
+  * `outdated` [--greedy] [--verbose|--quiet] [ <token> ...]:
+    Without token arguments, display all the installed Casks that have newer 
+    versions available in the tap; otherwise check only the tokens given 
+    in the command line.
+    If `--greedy` is given then also include in the output the Casks having 
+    `auto_updates true` or `version :latest`. Otherwise they are skipped
+    because there is no reliable way to know when updates are available for 
+    them.<br>
+    `--verbose` forces the display of the outdated and latest version.<br>
+    `--quiet` suppresses the display of versions.
 
   * `reinstall` <token> [ <token> ... ]:
     Reinstall the given Cask.
diff --git a/Library/Homebrew/test/cask/cask_spec.rb b/Library/Homebrew/test/cask/cask_spec.rb
index d76f2dce95..3971d3f9c0 100644
--- a/Library/Homebrew/test/cask/cask_spec.rb
+++ b/Library/Homebrew/test/cask/cask_spec.rb
@@ -89,4 +89,89 @@ describe Hbc::Cask, :cask do
       expect(c.metadata_versioned_container_path.to_s).to eq(metadata_path.to_s)
     end
   end
+
+  describe "outdated" do
+    it "ignores the Casks that have auto_updates true (without --greedy)" do
+      c = Hbc.load("auto-updates")
+      expect(c).not_to be_outdated
+      expect(c.outdated_versions).to be_empty
+    end
+
+    it "ignores the Casks that have version :latest (without --greedy)" do
+      c = Hbc.load("version-latest-string")
+      expect(c).not_to be_outdated
+      expect(c.outdated_versions).to be_empty
+    end
+
+    describe "versioned casks" do
+      let(:cask) { described_class.new("basic-cask") }
+      subject { cask.outdated_versions }
+
+      shared_examples "versioned casks" do |tap_version, expectations|
+        expectations.each do |installed_versions, expected_output|
+          context "when versions #{installed_versions.inspect} are installed and the tap version is #{tap_version}" do
+            it {
+              allow(cask).to receive(:versions).and_return(installed_versions)
+              allow(cask).to receive(:version).and_return(Hbc::DSL::Version.new(tap_version))
+              expect(cask).to receive(:outdated_versions).and_call_original
+              is_expected.to eq expected_output
+            }
+          end
+        end
+      end
+
+      describe "installed version is equal to tap version => not outdated" do
+        include_examples "versioned casks", "1.2.3",
+                         ["1.2.3"]          => [],
+                         ["1.2.4", "1.2.3"] => []
+      end
+
+      describe "installed version is different than tap version => outdated" do
+        include_examples "versioned casks", "1.2.4",
+                         ["1.2.3"]                   => ["1.2.3"],
+                         ["1.2.4", "1.2.3"]          => ["1.2.3"],
+                         ["1.2.2", "1.2.3"]          => ["1.2.2", "1.2.3"],
+                         ["1.2.2", "1.2.4", "1.2.3"] => ["1.2.2", "1.2.3"]
+      end
+    end
+
+    describe ":latest casks" do
+      let(:cask) { described_class.new("basic-cask") }
+
+      shared_examples ":latest cask" do |greedy, tap_version, expectations|
+        expectations.each do |installed_version, expected_output|
+          context "when versions #{installed_version} are installed and the tap version is #{tap_version}, #{greedy ? "" : "not"} greedy" do
+            subject { cask.outdated_versions greedy }
+            it {
+              allow(cask).to receive(:versions).and_return(installed_version)
+              allow(cask).to receive(:version).and_return(Hbc::DSL::Version.new(tap_version))
+              expect(cask).to receive(:outdated_versions).and_call_original
+              is_expected.to eq expected_output
+            }
+          end
+        end
+      end
+
+      describe ":latest version installed, :latest version in tap" do
+        include_examples ":latest cask", false, "latest",
+                         ["latest"] => []
+        include_examples ":latest cask", true, "latest",
+                         ["latest"] => ["latest"]
+      end
+
+      describe "numbered version installed, :latest version in tap" do
+        include_examples ":latest cask", false, "latest",
+                         ["1.2.3"] => ["1.2.3"]
+        include_examples ":latest cask", true, "latest",
+                         ["1.2.3"] => ["1.2.3"]
+      end
+
+      describe "latest version installed, numbered version in tap" do
+        include_examples ":latest cask", false, "1.2.3",
+                         ["latest"] => ["latest"]
+        include_examples ":latest cask", true, "1.2.3",
+                         ["latest"] => ["latest"]
+      end
+    end
+  end
 end
diff --git a/Library/Homebrew/test/cask/cli/outdated_spec.rb b/Library/Homebrew/test/cask/cli/outdated_spec.rb
new file mode 100644
index 0000000000..a0f13009de
--- /dev/null
+++ b/Library/Homebrew/test/cask/cli/outdated_spec.rb
@@ -0,0 +1,80 @@
+describe Hbc::CLI::Outdated, :cask do
+  let(:installed) do
+    [
+      Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/basic-cask.rb"),
+      Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/outdated/local-caffeine.rb"),
+      Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/outdated/local-transmission.rb"),
+      Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/version-latest-string.rb"),
+      Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/outdated/auto-updates.rb"),
+    ]
+  end
+
+  before do
+    shutup do
+      installed.each { |cask| InstallHelper.install_with_caskfile(cask) }
+    end
+    allow(Hbc::CLI).to receive(:verbose?).and_return(true)
+  end
+
+  describe 'without --greedy it ignores the Casks with "vesion latest" or "auto_updates true"' do
+    it "checks all the installed Casks when no token is provided" do
+      expect {
+        Hbc::CLI::Outdated.run
+      }.to output(<<-EOS.undent).to_stdout
+        local-caffeine (1.2.2) != 1.2.3
+        local-transmission (2.60) != 2.61
+      EOS
+    end
+
+    it "checks only the tokens specified in the command line" do
+      expect {
+        Hbc::CLI::Outdated.run("local-caffeine")
+      }.to output(<<-EOS.undent).to_stdout
+        local-caffeine (1.2.2) != 1.2.3
+      EOS
+    end
+
+    it 'ignores "auto_updates" and "latest" Casks even when their tokens are provided in the command line' do
+      expect {
+        Hbc::CLI::Outdated.run("local-caffeine", "auto-updates", "version-latest-string")
+      }.to output(<<-EOS.undent).to_stdout
+        local-caffeine (1.2.2) != 1.2.3
+      EOS
+    end
+  end
+
+  it "lists only the names (no versions) of the outdated Casks with --quiet" do
+    expect {
+      Hbc::CLI::Outdated.run("--quiet")
+    }.to output(<<-EOS.undent).to_stdout
+      local-caffeine
+      local-transmission
+    EOS
+  end
+
+  describe "with --greedy it checks additional Casks" do
+    it 'includes the Casks with "auto_updates true" or "version latest" with --greedy' do
+      expect {
+        Hbc::CLI::Outdated.run("--greedy")
+      }.to output(<<-EOS.undent).to_stdout
+        auto-updates (2.57) != 2.61
+        local-caffeine (1.2.2) != 1.2.3
+        local-transmission (2.60) != 2.61
+        version-latest-string (latest) != latest
+      EOS
+    end
+
+    it 'does not include the Casks with "auto_updates true" when the version did not change' do
+      cask = Hbc::CaskLoader.load_from_file(TEST_FIXTURE_DIR/"cask/Casks/auto-updates.rb")
+      InstallHelper.install_with_caskfile(cask)
+
+      expect {
+        Hbc::CLI::Outdated.run("--greedy")
+      }.to output(<<-EOS.undent).to_stdout
+        local-caffeine (1.2.2) != 1.2.3
+        local-transmission (2.60) != 2.61
+        version-latest-string (latest) != latest
+      EOS
+    end
+  end
+end
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/auto-updates.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/auto-updates.rb
new file mode 100644
index 0000000000..e202f5a163
--- /dev/null
+++ b/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/auto-updates.rb
@@ -0,0 +1,11 @@
+cask 'auto-updates' do
+  version '2.57'
+  sha256 'e44ffa103fbf83f55c8d0b1bea309a43b2880798dae8620b1ee8da5e1095ec68'
+
+  url "file://#{TEST_FIXTURE_DIR}/cask/transmission-2.61.dmg"
+  homepage 'http://example.com/auto-updates'
+
+  auto_updates true
+
+  app 'Transmission.app'
+end
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/local-caffeine.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/local-caffeine.rb
new file mode 100644
index 0000000000..2c7f3e6ec3
--- /dev/null
+++ b/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/local-caffeine.rb
@@ -0,0 +1,9 @@
+cask 'local-caffeine' do
+  version '1.2.2'
+  sha256 '67cdb8a02803ef37fdbf7e0be205863172e41a561ca446cd84f0d7ab35a99d94'
+
+  url "file://#{TEST_FIXTURE_DIR}/cask/caffeine.zip"
+  homepage 'http://example.com/local-caffeine'
+
+  app 'Caffeine.app'
+end
diff --git a/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/local-transmission.rb b/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/local-transmission.rb
new file mode 100644
index 0000000000..903f152d27
--- /dev/null
+++ b/Library/Homebrew/test/support/fixtures/cask/Casks/outdated/local-transmission.rb
@@ -0,0 +1,9 @@
+cask 'local-transmission' do
+  version '2.60'
+  sha256 'e44ffa103fbf83f55c8d0b1bea309a43b2880798dae8620b1ee8da5e1095ec68'
+
+  url "file://#{TEST_FIXTURE_DIR}/cask/transmission-2.61.dmg"
+  homepage 'http://example.com/local-transmission'
+
+  app 'Transmission.app'
+end
diff --git a/manpages/brew-cask.1 b/manpages/brew-cask.1
index c5708f7cbd..8a7b557c08 100644
--- a/manpages/brew-cask.1
+++ b/manpages/brew-cask.1
@@ -88,6 +88,16 @@ Without any arguments, list all installed Casks\. With \fB\-1\fR, always format
 If \fItoken\fR is given, summarize the staged files associated with the given Cask\.
 .
 .TP
+\fBoutdated\fR [\-\-greedy] [\-\-verbose|\-\-quiet] [ \fItoken\fR \.\.\.]
+Without token arguments, display all the installed Casks that have newer versions available in the tap; otherwise check only the tokens given in the command line\. If \fB\-\-greedy\fR is given then also include in the output the Casks having \fBauto_updates true\fR or \fBversion :latest\fR\. Otherwise they are skipped because there is no reliable way to know when updates are available for them\.
+.
+.br
+\fB\-\-verbose\fR forces the display of the outdated and latest version\.
+.
+.br
+\fB\-\-quiet\fR suppresses the display of versions\.
+.
+.TP
 \fBreinstall\fR \fItoken\fR [ \fItoken\fR \.\.\. ]
 Reinstall the given Cask\.
 .