diff --git a/src/__phutil_library_map__.php b/src/__phutil_library_map__.php
--- a/src/__phutil_library_map__.php
+++ b/src/__phutil_library_map__.php
@@ -154,6 +154,8 @@
     'ArcanistRepositoryAPIMiscTestCase' => 'repository/api/__tests__/ArcanistRepositoryAPIMiscTestCase.php',
     'ArcanistRepositoryAPIStateTestCase' => 'repository/api/__tests__/ArcanistRepositoryAPIStateTestCase.php',
     'ArcanistRevertWorkflow' => 'workflow/ArcanistRevertWorkflow.php',
+    'ArcanistRuboCopLinter' => 'lint/linter/ArcanistRuboCopLinter.php',
+    'ArcanistRuboCopLinterTestCase' => 'lint/linter/__tests__/ArcanistRuboCopLinterTestCase.php',
     'ArcanistRubyLinter' => 'lint/linter/ArcanistRubyLinter.php',
     'ArcanistRubyLinterTestCase' => 'lint/linter/__tests__/ArcanistRubyLinterTestCase.php',
     'ArcanistScriptAndRegexLinter' => 'lint/linter/ArcanistScriptAndRegexLinter.php',
@@ -335,6 +337,8 @@
     'ArcanistRepositoryAPIMiscTestCase' => 'ArcanistTestCase',
     'ArcanistRepositoryAPIStateTestCase' => 'ArcanistTestCase',
     'ArcanistRevertWorkflow' => 'ArcanistWorkflow',
+    'ArcanistRuboCopLinter' => 'ArcanistExternalLinter',
+    'ArcanistRuboCopLinterTestCase' => 'ArcanistArcanistLinterTestCase',
     'ArcanistRubyLinter' => 'ArcanistExternalLinter',
     'ArcanistRubyLinterTestCase' => 'ArcanistArcanistLinterTestCase',
     'ArcanistScriptAndRegexLinter' => 'ArcanistLinter',
diff --git a/src/lint/linter/ArcanistRuboCopLinter.php b/src/lint/linter/ArcanistRuboCopLinter.php
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/ArcanistRuboCopLinter.php
@@ -0,0 +1,127 @@
+<?php
+
+final class ArcanistRuboCopLinter extends ArcanistExternalLinter {
+
+  private $config;
+
+  public function getInfoName() {
+    return 'RuboCop';
+  }
+
+  public function getInfoURI() {
+    return 'http://batsov.com/rubocop';
+  }
+
+  public function getInfoDescription() {
+    return pht(
+      'RuboCop is a Ruby static code analyzer, based on the community Ruby '.
+      'style guide.');
+  }
+
+  public function getLinterName() {
+    return 'RuboCop';
+  }
+
+  public function getLinterConfigurationName() {
+    return 'rubocop';
+  }
+
+  public function getDefaultBinary() {
+    return 'rubocop';
+  }
+
+  public function getVersion() {
+    list($stdout) = execx('%C --version', $this->getExecutableCommand());
+
+    $matches = array();
+    if (preg_match('/^(?P<version>\d+\.\d+\.\d+)$/', $stdout, $matches)) {
+      return $matches['version'];
+    } else {
+      return false;
+    }
+  }
+
+  public function getInstallInstructions() {
+    return pht('Install RuboCop using `gem install rubocop`.');
+  }
+
+  public function shouldExpectCommandErrors() {
+    return true;
+  }
+
+  public function supportsReadDataFromStdin() {
+    return false;
+  }
+
+  protected function getMandatoryFlags() {
+    $options = array(
+      '--format=json',
+      '--force-exclusion',
+      '--no-color',
+    );
+
+    if ($this->config) {
+      $options[] = '--config='.$this->config;
+    }
+
+    return $options;
+  }
+
+  public function getLinterConfigurationOptions() {
+    $options = array(
+      'rubocop.config' => array(
+        'type' => 'optional string',
+        'help' => pht('A custom configuration file.'),
+      ),
+    );
+
+    return $options + parent::getLinterConfigurationOptions();
+  }
+
+  public function setLinterConfigurationValue($key, $value) {
+    switch ($key) {
+      case 'rubocop.config':
+        $this->config = $value;
+        return;
+    }
+
+    return parent::setLinterConfigurationValue($key, $value);
+  }
+
+  protected function parseLinterOutput($path, $err, $stdout, $stderr) {
+    $results = phutil_json_decode($stdout);
+    $messages = array();
+
+    foreach ($results['files'] as $file) {
+      foreach ($file['offenses'] as $offense) {
+        $message = new ArcanistLintMessage();
+
+        $message->setPath($file['path']);
+        $message->setDescription($offense['message']);
+
+        $message->setLine($offense['location']['line']);
+        $message->setChar($offense['location']['column']);
+
+        switch ($offense['severity']) {
+          case 'warning':
+            $message->setSeverity(ArcanistLintSeverity::SEVERITY_WARNING);
+            break;
+          case 'error':
+          case 'fatal':
+            $message->setSeverity(ArcanistLintSeverity::SEVERITY_ERROR);
+            break;
+          default:
+            $message->setSeverity(ArcanistLintSeverity::SEVERITY_ADVICE);
+            break;
+        }
+
+        $message->setName($this->getLinterName());
+        $message->setCode($offense['cop_name']);
+
+        $messages[] = $message;
+      }
+    }
+
+    return $messages;
+  }
+}
diff --git a/src/lint/linter/__tests__/ArcanistRuboCopLinterTestCase.php b/src/lint/linter/__tests__/ArcanistRuboCopLinterTestCase.php
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/ArcanistRuboCopLinterTestCase.php
@@ -0,0 +1,12 @@
+<?php
+
+final class ArcanistRuboCopLinterTestCase
+  extends ArcanistArcanistLinterTestCase {
+
+  public function testRuboCopLinter() {
+    $this->executeTestsInDirectory(
+      dirname(__FILE__).'/rubocop/',
+      new ArcanistRuboCopLinter());
+  }
+
+}
diff --git a/src/lint/linter/__tests__/rubocop/convention.lint-test b/src/lint/linter/__tests__/rubocop/convention.lint-test
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/rubocop/convention.lint-test
@@ -0,0 +1,4 @@
+def hello()
+end
+~~~~~~~~~~
+advice:1:10
diff --git a/src/lint/linter/__tests__/rubocop/error.lint-test b/src/lint/linter/__tests__/rubocop/error.lint-test
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/rubocop/error.lint-test
@@ -0,0 +1,4 @@
+def hello
+  puts 'world'
+~~~~~~~~~~
+error:3:1
diff --git a/src/lint/linter/__tests__/rubocop/no_errors.lint-test b/src/lint/linter/__tests__/rubocop/no_errors.lint-test
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/rubocop/no_errors.lint-test
@@ -0,0 +1,4 @@
+def hello
+  puts 'hello world'
+end
+~~~~~~~~~~
diff --git a/src/lint/linter/__tests__/rubocop/warning.lint-test b/src/lint/linter/__tests__/rubocop/warning.lint-test
new file mode 100644
--- /dev/null
+++ b/src/lint/linter/__tests__/rubocop/warning.lint-test
@@ -0,0 +1,5 @@
+def hello(unused)
+  puts 'hi'
+end
+~~~~~~~~~
+warning:1:11