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
@@ -612,13 +612,17 @@
     'DiffusionCloneURIView' => 'applications/diffusion/view/DiffusionCloneURIView.php',
     'DiffusionCommandEngine' => 'applications/diffusion/protocol/DiffusionCommandEngine.php',
     'DiffusionCommandEngineTestCase' => 'applications/diffusion/protocol/__tests__/DiffusionCommandEngineTestCase.php',
+    'DiffusionCommitAcceptTransaction' => 'applications/diffusion/xaction/DiffusionCommitAcceptTransaction.php',
+    'DiffusionCommitActionTransaction' => 'applications/diffusion/xaction/DiffusionCommitActionTransaction.php',
     'DiffusionCommitAffectedFilesHeraldField' => 'applications/diffusion/herald/DiffusionCommitAffectedFilesHeraldField.php',
+    'DiffusionCommitAuditTransaction' => 'applications/diffusion/xaction/DiffusionCommitAuditTransaction.php',
     'DiffusionCommitAuditorsTransaction' => 'applications/diffusion/xaction/DiffusionCommitAuditorsTransaction.php',
     'DiffusionCommitAuthorHeraldField' => 'applications/diffusion/herald/DiffusionCommitAuthorHeraldField.php',
     'DiffusionCommitAutocloseHeraldField' => 'applications/diffusion/herald/DiffusionCommitAutocloseHeraldField.php',
     'DiffusionCommitBranchesController' => 'applications/diffusion/controller/DiffusionCommitBranchesController.php',
     'DiffusionCommitBranchesHeraldField' => 'applications/diffusion/herald/DiffusionCommitBranchesHeraldField.php',
     'DiffusionCommitCommitterHeraldField' => 'applications/diffusion/herald/DiffusionCommitCommitterHeraldField.php',
+    'DiffusionCommitConcernTransaction' => 'applications/diffusion/xaction/DiffusionCommitConcernTransaction.php',
     'DiffusionCommitController' => 'applications/diffusion/controller/DiffusionCommitController.php',
     'DiffusionCommitDiffContentAddedHeraldField' => 'applications/diffusion/herald/DiffusionCommitDiffContentAddedHeraldField.php',
     'DiffusionCommitDiffContentHeraldField' => 'applications/diffusion/herald/DiffusionCommitDiffContentHeraldField.php',
@@ -652,6 +656,7 @@
     'DiffusionCommitRemarkupRuleTestCase' => 'applications/diffusion/remarkup/__tests__/DiffusionCommitRemarkupRuleTestCase.php',
     'DiffusionCommitRepositoryHeraldField' => 'applications/diffusion/herald/DiffusionCommitRepositoryHeraldField.php',
     'DiffusionCommitRepositoryProjectsHeraldField' => 'applications/diffusion/herald/DiffusionCommitRepositoryProjectsHeraldField.php',
+    'DiffusionCommitResignTransaction' => 'applications/diffusion/xaction/DiffusionCommitResignTransaction.php',
     'DiffusionCommitRevertedByCommitEdgeType' => 'applications/diffusion/edge/DiffusionCommitRevertedByCommitEdgeType.php',
     'DiffusionCommitRevertsCommitEdgeType' => 'applications/diffusion/edge/DiffusionCommitRevertsCommitEdgeType.php',
     'DiffusionCommitReviewerHeraldField' => 'applications/diffusion/herald/DiffusionCommitReviewerHeraldField.php',
@@ -5313,13 +5318,17 @@
     'DiffusionCloneURIView' => 'AphrontView',
     'DiffusionCommandEngine' => 'Phobject',
     'DiffusionCommandEngineTestCase' => 'PhabricatorTestCase',
+    'DiffusionCommitAcceptTransaction' => 'DiffusionCommitAuditTransaction',
+    'DiffusionCommitActionTransaction' => 'DiffusionCommitTransactionType',
     'DiffusionCommitAffectedFilesHeraldField' => 'DiffusionCommitHeraldField',
+    'DiffusionCommitAuditTransaction' => 'DiffusionCommitActionTransaction',
     'DiffusionCommitAuditorsTransaction' => 'DiffusionCommitTransactionType',
     'DiffusionCommitAuthorHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitAutocloseHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitBranchesController' => 'DiffusionController',
     'DiffusionCommitBranchesHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitCommitterHeraldField' => 'DiffusionCommitHeraldField',
+    'DiffusionCommitConcernTransaction' => 'DiffusionCommitAuditTransaction',
     'DiffusionCommitController' => 'DiffusionController',
     'DiffusionCommitDiffContentAddedHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitDiffContentHeraldField' => 'DiffusionCommitHeraldField',
@@ -5353,6 +5362,7 @@
     'DiffusionCommitRemarkupRuleTestCase' => 'PhabricatorTestCase',
     'DiffusionCommitRepositoryHeraldField' => 'DiffusionCommitHeraldField',
     'DiffusionCommitRepositoryProjectsHeraldField' => 'DiffusionCommitHeraldField',
+    'DiffusionCommitResignTransaction' => 'DiffusionCommitAuditTransaction',
     'DiffusionCommitRevertedByCommitEdgeType' => 'PhabricatorEdgeType',
     'DiffusionCommitRevertsCommitEdgeType' => 'PhabricatorEdgeType',
     'DiffusionCommitReviewerHeraldField' => 'DiffusionCommitHeraldField',
diff --git a/src/applications/diffusion/editor/DiffusionCommitEditEngine.php b/src/applications/diffusion/editor/DiffusionCommitEditEngine.php
--- a/src/applications/diffusion/editor/DiffusionCommitEditEngine.php
+++ b/src/applications/diffusion/editor/DiffusionCommitEditEngine.php
@@ -5,6 +5,9 @@
 
   const ENGINECONST = 'diffusion.commit';
 
+  const ACTIONGROUP_AUDIT = 'audit';
+  const ACTIONGROUP_COMMIT = 'commit';
+
   public function isEngineConfigurable() {
     return false;
   }
@@ -130,6 +133,13 @@
           ->setValue(array($desc, " \xC2\xB7 ", $doc_link));
     }
 
+    $actions = DiffusionCommitActionTransaction::loadAllActions();
+    $actions = msortv($actions, 'getCommitActionOrderVector');
+
+    foreach ($actions as $key => $action) {
+      $fields[] = $action->newEditField($object, $viewer);
+    }
+
     return $fields;
   }
 
diff --git a/src/applications/diffusion/xaction/DiffusionCommitAcceptTransaction.php b/src/applications/diffusion/xaction/DiffusionCommitAcceptTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/xaction/DiffusionCommitAcceptTransaction.php
@@ -0,0 +1,74 @@
+<?php
+
+final class DiffusionCommitAcceptTransaction
+  extends DiffusionCommitAuditTransaction {
+
+  const TRANSACTIONTYPE = 'diffusion.commit.accept';
+  const ACTIONKEY = 'accept';
+
+  protected function getCommitActionLabel() {
+    return pht("Accept Commit \xE2\x9C\x94");
+  }
+
+  protected function getCommitActionDescription() {
+    return pht('This commit will be approved.');
+  }
+
+  public function getIcon() {
+    return 'fa-check-circle-o';
+  }
+
+  public function getColor() {
+    return 'green';
+  }
+
+  protected function getCommitActionOrder() {
+    return 500;
+  }
+
+  public function generateOldValue($object) {
+    $actor = $this->getActor();
+    return $this->isViewerAcceptingAuditor($object, $actor);
+  }
+
+  public function applyExternalEffects($object, $value) {
+    $status = PhabricatorAuditStatusConstants::ACCEPTED;
+    $actor = $this->getActor();
+    $this->applyAuditorEffect($object, $actor, $value, $status);
+  }
+
+  protected function validateAction($object, PhabricatorUser $viewer) {
+    $config_key = 'audit.can-author-close-audit';
+    if (!PhabricatorEnv::getEnvConfig($config_key)) {
+      if ($this->isViewerCommitAuthor($object, $viewer)) {
+        throw new Exception(
+          pht(
+            'You can not accept this commit because you are the commit '.
+            'author. You can only accept commits you did not author. You can '.
+            'change this behavior by adjusting the "%s" setting in Config.',
+            $config_key));
+      }
+    }
+
+    if ($this->isViewerAcceptingAuditor($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not accept this commit because you have already '.
+          'accepted it.'));
+    }
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s accepted this commit.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s accepted %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+}
diff --git a/src/applications/diffusion/xaction/DiffusionCommitActionTransaction.php b/src/applications/diffusion/xaction/DiffusionCommitActionTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/xaction/DiffusionCommitActionTransaction.php
@@ -0,0 +1,118 @@
+<?php
+
+abstract class DiffusionCommitActionTransaction
+  extends DiffusionCommitTransactionType {
+
+  final public function getCommitActionKey() {
+    return $this->getPhobjectClassConstant('ACTIONKEY', 32);
+  }
+
+  public function isActionAvailable($object, PhabricatorUser $viewer) {
+    try {
+      $this->validateAction($object, $viewer);
+      return true;
+    } catch (Exception $ex) {
+      return false;
+    }
+  }
+
+  abstract protected function validateAction($object, PhabricatorUser $viewer);
+  abstract protected function getCommitActionLabel();
+
+  public function getCommandKeyword() {
+    return null;
+  }
+
+  public function getCommandAliases() {
+    return array();
+  }
+
+  public function getCommandSummary() {
+    return null;
+  }
+
+  protected function getCommitActionOrder() {
+    return 1000;
+  }
+
+  public function getCommitActionOrderVector() {
+    return id(new PhutilSortVector())
+      ->addInt($this->getCommitActionOrder());
+  }
+
+  protected function getCommitActionGroupKey() {
+    return DiffusionCommitEditEngine::ACTIONGROUP_COMMIT;
+  }
+
+  protected function getCommitActionDescription() {
+    return null;
+  }
+
+  public static function loadAllActions() {
+    return id(new PhutilClassMapQuery())
+      ->setAncestorClass(__CLASS__)
+      ->setUniqueMethod('getCommitActionKey')
+      ->execute();
+  }
+
+  protected function isViewerCommitAuthor(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer) {
+
+    if (!$viewer->getPHID()) {
+      return false;
+    }
+
+    return ($viewer->getPHID() === $commit->getAuthorPHID());
+  }
+
+  public function newEditField(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer) {
+
+    $field = id(new PhabricatorApplyEditField())
+      ->setKey($this->getCommitActionKey())
+      ->setTransactionType($this->getTransactionTypeConstant())
+      ->setValue(true);
+
+    if ($this->isActionAvailable($commit, $viewer)) {
+      $label = $this->getCommitActionLabel();
+      if ($label !== null) {
+        $field->setCommentActionLabel($label);
+
+        $description = $this->getCommitActionDescription();
+        $field->setActionDescription($description);
+
+        $group_key = $this->getCommitActionGroupKey();
+        $field->setCommentActionGroupKey($group_key);
+
+        $field->setActionConflictKey('commit.action');
+      }
+    }
+
+    return $field;
+  }
+
+  public function validateTransactions($object, array $xactions) {
+    $errors = array();
+    $actor = $this->getActor();
+
+    $action_exception = null;
+    try {
+      $this->validateAction($object, $actor);
+    } catch (Exception $ex) {
+      $action_exception = $ex;
+    }
+
+    foreach ($xactions as $xaction) {
+      if ($action_exception) {
+        $errors[] = $this->newInvalidError(
+          $action_exception->getMessage(),
+          $xaction);
+      }
+    }
+
+    return $errors;
+  }
+
+}
diff --git a/src/applications/diffusion/xaction/DiffusionCommitAuditTransaction.php b/src/applications/diffusion/xaction/DiffusionCommitAuditTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/xaction/DiffusionCommitAuditTransaction.php
@@ -0,0 +1,101 @@
+<?php
+
+abstract class DiffusionCommitAuditTransaction
+  extends DiffusionCommitActionTransaction {
+
+  protected function getCommitActionGroupKey() {
+    return DiffusionCommitEditEngine::ACTIONGROUP_AUDIT;
+  }
+
+  protected function isViewerAnyAuditor(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer) {
+    return ($this->getViewerAuditStatus($commit, $viewer) !== null);
+  }
+
+  protected function isViewerAcceptingAuditor(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer) {
+    return $this->isViewerAuditStatusAmong(
+      $commit,
+      $viewer,
+      array(
+        PhabricatorAuditStatusConstants::ACCEPTED,
+      ));
+  }
+
+  protected function isViewerRejectingAuditor(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer) {
+    return $this->isViewerAuditStatusAmong(
+      $commit,
+      $viewer,
+      array(
+        PhabricatorAuditStatusConstants::CONCERNED,
+      ));
+  }
+
+  protected function getViewerAuditStatus(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer) {
+
+    if (!$viewer->getPHID()) {
+      return null;
+    }
+
+    foreach ($commit->getAudits() as $audit) {
+      if ($audit->getAuditorPHID() != $viewer->getPHID()) {
+        continue;
+      }
+
+      return $audit->getAuditStatus();
+    }
+
+    return null;
+  }
+
+  protected function isViewerAuditStatusAmong(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer,
+    array $status_list) {
+
+    $status = $this->getViewerAuditStatus($commit, $viewer);
+    if ($status === null) {
+      return false;
+    }
+
+    $status_map = array_fuse($status_list);
+    return isset($status_map[$status]);
+  }
+
+  protected function applyAuditorEffect(
+    PhabricatorRepositoryCommit $commit,
+    PhabricatorUser $viewer,
+    $value,
+    $status) {
+
+    $audits = $commit->getAudits();
+    $audits = mpull($audits, null, 'getAuditorPHID');
+
+    $map = array();
+
+    $with_authority = ($status != PhabricatorAuditStatusConstants::RESIGNED);
+    if ($with_authority) {
+      $has_authority = PhabricatorAuditCommentEditor::loadAuditPHIDsForUser(
+        $viewer);
+      $has_authority = array_fuse($has_authority);
+      foreach ($audits as $audit) {
+        $auditor_phid = $audit->getAuditorPHID();
+        if (isset($has_authority[$auditor_phid])) {
+          $map[$auditor_phid] = $status;
+        }
+      }
+    }
+
+    // In all cases, you affect yourself.
+    $map[$viewer->getPHID()] = $status;
+
+    $this->updateAudits($commit, $map);
+  }
+
+}
diff --git a/src/applications/diffusion/xaction/DiffusionCommitAuditorsTransaction.php b/src/applications/diffusion/xaction/DiffusionCommitAuditorsTransaction.php
--- a/src/applications/diffusion/xaction/DiffusionCommitAuditorsTransaction.php
+++ b/src/applications/diffusion/xaction/DiffusionCommitAuditorsTransaction.php
@@ -75,22 +75,7 @@
       }
     }
 
-    foreach ($new as $phid => $status) {
-      $auditor = idx($auditors, $phid);
-      if (!$auditor) {
-        $auditor = id(new PhabricatorRepositoryAuditRequest())
-          ->setAuditorPHID($phid)
-          ->setCommitPHID($object->getPHID());
-      } else {
-        if ($auditor->getAuditStatus() === $status) {
-          continue;
-        }
-      }
-
-      $auditor
-        ->setAuditStatus($status)
-        ->save();
-    }
+    $this->updateAudits($object, $new);
   }
 
   public function getTitle() {
diff --git a/src/applications/diffusion/xaction/DiffusionCommitConcernTransaction.php b/src/applications/diffusion/xaction/DiffusionCommitConcernTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/xaction/DiffusionCommitConcernTransaction.php
@@ -0,0 +1,70 @@
+<?php
+
+final class DiffusionCommitConcernTransaction
+  extends DiffusionCommitAuditTransaction {
+
+  const TRANSACTIONTYPE = 'diffusion.commit.concern';
+  const ACTIONKEY = 'concern';
+
+  protected function getCommitActionLabel() {
+    return pht("Raise Concern \xE2\x9C\x98");
+  }
+
+  protected function getCommitActionDescription() {
+    return pht('This commit will be returned to the author for consideration.');
+  }
+
+  public function getIcon() {
+    return 'fa-times-circle-o';
+  }
+
+  public function getColor() {
+    return 'red';
+  }
+
+  protected function getCommitActionOrder() {
+    return 600;
+  }
+
+  public function generateOldValue($object) {
+    $actor = $this->getActor();
+    return $this->isViewerRejectingAuditor($object, $actor);
+  }
+
+  public function applyExternalEffects($object, $value) {
+    $status = PhabricatorAuditStatusConstants::CONCERNED;
+    $actor = $this->getActor();
+    $this->applyAuditorEffect($object, $actor, $value, $status);
+  }
+
+  protected function validateAction($object, PhabricatorUser $viewer) {
+    if ($this->isViewerCommitAuthor($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not raise a concern with this commit because you are '.
+          'the commit author. You can only raise concerns with commits '.
+          'you did not author.'));
+    }
+
+    if ($this->isViewerRejectingAuditor($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not raise a concern with this commit because you have '.
+          'already raised a concern with it.'));
+    }
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s raised a concern with this commit.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s raised a concern with %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+}
diff --git a/src/applications/diffusion/xaction/DiffusionCommitResignTransaction.php b/src/applications/diffusion/xaction/DiffusionCommitResignTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/diffusion/xaction/DiffusionCommitResignTransaction.php
@@ -0,0 +1,62 @@
+<?php
+
+final class DiffusionCommitResignTransaction
+  extends DiffusionCommitAuditTransaction {
+
+  const TRANSACTIONTYPE = 'diffusion.commit.resign';
+  const ACTIONKEY = 'resign';
+
+  protected function getCommitActionLabel() {
+    return pht('Resign as Auditor');
+  }
+
+  protected function getCommitActionDescription() {
+    return pht('You will resign as an auditor for this commit.');
+  }
+
+  public function getIcon() {
+    return 'fa-flag';
+  }
+
+  public function getColor() {
+    return 'orange';
+  }
+
+  protected function getCommitActionOrder() {
+    return 700;
+  }
+
+  public function generateOldValue($object) {
+    $actor = $this->getActor();
+    return !$this->isViewerAnyAuditor($object, $actor);
+  }
+
+  public function applyExternalEffects($object, $value) {
+    $status = PhabricatorAuditStatusConstants::RESIGNED;
+    $actor = $this->getActor();
+    $this->applyAuditorEffect($object, $actor, $value, $status);
+  }
+
+  protected function validateAction($object, PhabricatorUser $viewer) {
+    if (!$this->isViewerAnyAuditor($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not resign from this commit because you are not an '.
+          'auditor.'));
+    }
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s resigned from this commit.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s resigned from %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+}
diff --git a/src/applications/diffusion/xaction/DiffusionCommitTransactionType.php b/src/applications/diffusion/xaction/DiffusionCommitTransactionType.php
--- a/src/applications/diffusion/xaction/DiffusionCommitTransactionType.php
+++ b/src/applications/diffusion/xaction/DiffusionCommitTransactionType.php
@@ -1,4 +1,37 @@
 <?php
 
 abstract class DiffusionCommitTransactionType
-  extends PhabricatorModularTransactionType {}
+  extends PhabricatorModularTransactionType {
+
+  protected function updateAudits(
+    PhabricatorRepositoryCommit $commit,
+    array $new) {
+
+    $audits = $commit->getAudits();
+    $audits = mpull($audits, null, 'getAuditorPHID');
+
+    foreach ($new as $phid => $status) {
+      $audit = idx($audits, $phid);
+      if (!$audit) {
+        $audit = id(new PhabricatorRepositoryAuditRequest())
+          ->setAuditorPHID($phid)
+          ->setCommitPHID($commit->getPHID());
+
+        $audits[$phid] = $audit;
+      } else {
+        if ($audit->getAuditStatus() === $status) {
+          continue;
+        }
+      }
+
+      $audit
+        ->setAuditStatus($status)
+        ->save();
+    }
+
+    $commit->attachAudits($audits);
+
+    return $audits;
+  }
+
+}