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
@@ -506,6 +506,7 @@
     'DifferentialReviewersView' => 'applications/differential/view/DifferentialReviewersView.php',
     'DifferentialRevision' => 'applications/differential/storage/DifferentialRevision.php',
     'DifferentialRevisionAbandonTransaction' => 'applications/differential/xaction/DifferentialRevisionAbandonTransaction.php',
+    'DifferentialRevisionAcceptTransaction' => 'applications/differential/xaction/DifferentialRevisionAcceptTransaction.php',
     'DifferentialRevisionActionTransaction' => 'applications/differential/xaction/DifferentialRevisionActionTransaction.php',
     'DifferentialRevisionAffectedFilesHeraldField' => 'applications/differential/herald/DifferentialRevisionAffectedFilesHeraldField.php',
     'DifferentialRevisionAuthorHeraldField' => 'applications/differential/herald/DifferentialRevisionAuthorHeraldField.php',
@@ -545,6 +546,7 @@
     'DifferentialRevisionPlanChangesTransaction' => 'applications/differential/xaction/DifferentialRevisionPlanChangesTransaction.php',
     'DifferentialRevisionQuery' => 'applications/differential/query/DifferentialRevisionQuery.php',
     'DifferentialRevisionReclaimTransaction' => 'applications/differential/xaction/DifferentialRevisionReclaimTransaction.php',
+    'DifferentialRevisionRejectTransaction' => 'applications/differential/xaction/DifferentialRevisionRejectTransaction.php',
     'DifferentialRevisionRelationship' => 'applications/differential/relationships/DifferentialRevisionRelationship.php',
     'DifferentialRevisionRelationshipSource' => 'applications/search/relationship/DifferentialRevisionRelationshipSource.php',
     'DifferentialRevisionReopenTransaction' => 'applications/differential/xaction/DifferentialRevisionReopenTransaction.php',
@@ -553,6 +555,7 @@
     'DifferentialRevisionRepositoryTransaction' => 'applications/differential/xaction/DifferentialRevisionRepositoryTransaction.php',
     'DifferentialRevisionRequestReviewTransaction' => 'applications/differential/xaction/DifferentialRevisionRequestReviewTransaction.php',
     'DifferentialRevisionRequiredActionResultBucket' => 'applications/differential/query/DifferentialRevisionRequiredActionResultBucket.php',
+    'DifferentialRevisionResignTransaction' => 'applications/differential/xaction/DifferentialRevisionResignTransaction.php',
     'DifferentialRevisionResultBucket' => 'applications/differential/query/DifferentialRevisionResultBucket.php',
     'DifferentialRevisionReviewersHeraldField' => 'applications/differential/herald/DifferentialRevisionReviewersHeraldField.php',
     'DifferentialRevisionReviewersTransaction' => 'applications/differential/xaction/DifferentialRevisionReviewersTransaction.php',
@@ -5180,6 +5183,7 @@
       'PhabricatorConduitResultInterface',
     ),
     'DifferentialRevisionAbandonTransaction' => 'DifferentialRevisionActionTransaction',
+    'DifferentialRevisionAcceptTransaction' => 'DifferentialRevisionActionTransaction',
     'DifferentialRevisionActionTransaction' => 'DifferentialRevisionTransactionType',
     'DifferentialRevisionAffectedFilesHeraldField' => 'DifferentialRevisionHeraldField',
     'DifferentialRevisionAuthorHeraldField' => 'DifferentialRevisionHeraldField',
@@ -5219,6 +5223,7 @@
     'DifferentialRevisionPlanChangesTransaction' => 'DifferentialRevisionActionTransaction',
     'DifferentialRevisionQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'DifferentialRevisionReclaimTransaction' => 'DifferentialRevisionActionTransaction',
+    'DifferentialRevisionRejectTransaction' => 'DifferentialRevisionActionTransaction',
     'DifferentialRevisionRelationship' => 'PhabricatorObjectRelationship',
     'DifferentialRevisionRelationshipSource' => 'PhabricatorObjectRelationshipSource',
     'DifferentialRevisionReopenTransaction' => 'DifferentialRevisionActionTransaction',
@@ -5227,6 +5232,7 @@
     'DifferentialRevisionRepositoryTransaction' => 'DifferentialRevisionTransactionType',
     'DifferentialRevisionRequestReviewTransaction' => 'DifferentialRevisionActionTransaction',
     'DifferentialRevisionRequiredActionResultBucket' => 'DifferentialRevisionResultBucket',
+    'DifferentialRevisionResignTransaction' => 'DifferentialRevisionActionTransaction',
     'DifferentialRevisionResultBucket' => 'PhabricatorSearchResultBucket',
     'DifferentialRevisionReviewersHeraldField' => 'DifferentialRevisionHeraldField',
     'DifferentialRevisionReviewersTransaction' => 'DifferentialRevisionTransactionType',
diff --git a/src/applications/differential/constants/DifferentialReviewerStatus.php b/src/applications/differential/constants/DifferentialReviewerStatus.php
--- a/src/applications/differential/constants/DifferentialReviewerStatus.php
+++ b/src/applications/differential/constants/DifferentialReviewerStatus.php
@@ -9,6 +9,7 @@
   const STATUS_COMMENTED = 'commented';
   const STATUS_ACCEPTED_OLDER = 'accepted-older';
   const STATUS_REJECTED_OLDER = 'rejected-older';
+  const STATUS_RESIGNED = 'resigned';
 
   /**
    * Returns the relative strength of a status, used to pick a winner when a
@@ -34,6 +35,7 @@
 
       self::STATUS_ACCEPTED   => 5,
       self::STATUS_REJECTED   => 5,
+      self::STATUS_RESIGNED => 5,
     );
 
     return idx($map, $constant, 0);
diff --git a/src/applications/differential/editor/DifferentialRevisionEditEngine.php b/src/applications/differential/editor/DifferentialRevisionEditEngine.php
--- a/src/applications/differential/editor/DifferentialRevisionEditEngine.php
+++ b/src/applications/differential/editor/DifferentialRevisionEditEngine.php
@@ -38,7 +38,8 @@
   protected function newObjectQuery() {
     return id(new DifferentialRevisionQuery())
       ->needActiveDiffs(true)
-      ->needReviewerStatus(true);
+      ->needReviewerStatus(true)
+      ->needReviewerAuthority(true);
   }
 
   protected function getObjectCreateTitleText($object) {
diff --git a/src/applications/differential/xaction/DifferentialRevisionAcceptTransaction.php b/src/applications/differential/xaction/DifferentialRevisionAcceptTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/differential/xaction/DifferentialRevisionAcceptTransaction.php
@@ -0,0 +1,77 @@
+<?php
+
+final class DifferentialRevisionAcceptTransaction
+  extends DifferentialRevisionActionTransaction {
+
+  const TRANSACTIONTYPE = 'differential.revision.accept';
+  const ACTIONKEY = 'accept';
+
+  protected function getRevisionActionLabel() {
+    return pht("Accept Revision \xE2\x9C\x94");
+  }
+
+  protected function getRevisionActionDescription() {
+    return pht('These changes will be approved.');
+  }
+
+  public function getIcon() {
+    return 'fa-check-circle-o';
+  }
+
+  public function getColor() {
+    return 'green';
+  }
+
+  public function generateOldValue($object) {
+    $actor = $this->getActor();
+    return $this->isViewerAcceptingReviewer($object, $actor);
+  }
+
+  public function applyExternalEffects($object, $value) {
+    $status = DifferentialReviewerStatus::STATUS_ACCEPTED;
+    $actor = $this->getActor();
+    $this->applyReviewerEffect($object, $actor, $value, $status);
+  }
+
+  protected function validateAction($object, PhabricatorUser $viewer) {
+    if ($object->isClosed()) {
+      throw new Exception(
+        pht(
+          'You can not accept this revision because it has already been '.
+          'closed. Only open revisions can be accepted.'));
+    }
+
+    $config_key = 'differential.allow-self-accept';
+    if (!PhabricatorEnv::getEnvConfig($config_key)) {
+      if ($this->isViewerRevisionAuthor($object, $viewer)) {
+        throw new Exception(
+          pht(
+            'You can not accept this revision because you are the revision '.
+            'author. You can only accept revisions you do not own. You can '.
+            'change this behavior by adjusting the "%s" setting in Config.',
+            $config_key));
+      }
+    }
+
+    if ($this->isViewerAcceptingReviewer($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not accept this revision because you have already '.
+          'accepted it.'));
+    }
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s accepted this revision.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s accepted %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+}
diff --git a/src/applications/differential/xaction/DifferentialRevisionActionTransaction.php b/src/applications/differential/xaction/DifferentialRevisionActionTransaction.php
--- a/src/applications/differential/xaction/DifferentialRevisionActionTransaction.php
+++ b/src/applications/differential/xaction/DifferentialRevisionActionTransaction.php
@@ -41,6 +41,116 @@
     return ($viewer->getPHID() === $revision->getAuthorPHID());
   }
 
+  protected function isViewerAnyReviewer(
+    DifferentialRevision $revision,
+    PhabricatorUser $viewer) {
+    return ($this->getViewerReviewerStatus($revision, $viewer) !== null);
+  }
+
+  protected function isViewerAcceptingReviewer(
+    DifferentialRevision $revision,
+    PhabricatorUser $viewer) {
+    return $this->isViewerReviewerStatusAmong(
+      $revision,
+      $viewer,
+      array(
+        DifferentialReviewerStatus::STATUS_ACCEPTED,
+      ));
+  }
+
+  protected function isViewerRejectingReviewer(
+    DifferentialRevision $revision,
+    PhabricatorUser $viewer) {
+    return $this->isViewerReviewerStatusAmong(
+      $revision,
+      $viewer,
+      array(
+        DifferentialReviewerStatus::STATUS_REJECTED,
+      ));
+  }
+
+  protected function getViewerReviewerStatus(
+    DifferentialRevision $revision,
+    PhabricatorUser $viewer) {
+
+    if (!$viewer->getPHID()) {
+      return null;
+    }
+
+    foreach ($revision->getReviewerStatus() as $reviewer) {
+      if ($reviewer->getReviewerPHID() != $viewer->getPHID()) {
+        continue;
+      }
+
+      return $reviewer->getStatus();
+    }
+
+    return null;
+  }
+
+  protected function isViewerReviewerStatusAmong(
+    DifferentialRevision $revision,
+    PhabricatorUser $viewer,
+    array $status_list) {
+
+    $status = $this->getViewerReviewerStatus($revision, $viewer);
+    if ($status === null) {
+      return false;
+    }
+
+    $status_map = array_fuse($status_list);
+    return isset($status_map[$status]);
+  }
+
+  protected function applyReviewerEffect(
+    DifferentialRevision $revision,
+    PhabricatorUser $viewer,
+    $value,
+    $status) {
+
+    $map = array();
+
+    // When you accept or reject, you may accept or reject on behalf of all
+    // reviewers you have authority for. When you resign, you only affect
+    // yourself.
+    $with_authority = ($status != DifferentialReviewerStatus::STATUS_RESIGNED);
+    if ($with_authority) {
+      foreach ($revision->getReviewerStatus() as $reviewer) {
+        if ($reviewer->hasAuthority($viewer)) {
+          $map[$reviewer->getReviewerPHID()] = $status;
+        }
+      }
+    }
+
+    // In all cases, you affect yourself.
+    $map[$viewer->getPHID()] = $status;
+
+    // Convert reviewer statuses into edge data.
+    foreach ($map as $reviewer_phid => $reviewer_status) {
+      $map[$reviewer_phid] = array(
+        'data' => array(
+          'status' => $reviewer_status,
+        ),
+      );
+    }
+
+    $src_phid = $revision->getPHID();
+    $edge_type = DifferentialRevisionHasReviewerEdgeType::EDGECONST;
+
+    $editor = new PhabricatorEdgeEditor();
+    foreach ($map as $dst_phid => $edge_data) {
+      if ($status == DifferentialReviewerStatus::STATUS_RESIGNED) {
+        // TODO: For now, we just remove these reviewers. In the future, we will
+        // store resignations explicitly.
+        $editor->removeEdge($src_phid, $edge_type, $dst_phid);
+      } else {
+        $editor->addEdge($src_phid, $edge_type, $dst_phid, $edge_data);
+      }
+    }
+
+    $editor->save();
+  }
+
   public function newEditField(
     DifferentialRevision $revision,
     PhabricatorUser $viewer) {
diff --git a/src/applications/differential/xaction/DifferentialRevisionRejectTransaction.php b/src/applications/differential/xaction/DifferentialRevisionRejectTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/differential/xaction/DifferentialRevisionRejectTransaction.php
@@ -0,0 +1,74 @@
+<?php
+
+final class DifferentialRevisionRejectTransaction
+  extends DifferentialRevisionActionTransaction {
+
+  const TRANSACTIONTYPE = 'differential.revision.reject';
+  const ACTIONKEY = 'reject';
+
+  protected function getRevisionActionLabel() {
+    return pht("Request Changes \xE2\x9C\x98");
+  }
+
+  protected function getRevisionActionDescription() {
+    return pht('This revision will be returned to the author for updates.');
+  }
+
+  public function getIcon() {
+    return 'fa-times-circle-o';
+  }
+
+  public function getColor() {
+    return 'red';
+  }
+
+  public function generateOldValue($object) {
+    $actor = $this->getActor();
+    return $this->isViewerRejectingReviewer($object, $actor);
+  }
+
+  public function applyExternalEffects($object, $value) {
+    $status = DifferentialReviewerStatus::STATUS_REJECTED;
+    $actor = $this->getActor();
+    $this->applyReviewerEffect($object, $actor, $value, $status);
+  }
+
+  protected function validateAction($object, PhabricatorUser $viewer) {
+    if ($object->isClosed()) {
+      throw new Exception(
+        pht(
+          'You can not request changes to this revision because it has '.
+          'already been closed. You can only request changes to open '.
+          'revisions.'));
+    }
+
+    if ($this->isViewerRevisionAuthor($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not request changes to this revision because you are the '.
+          'revision author. You can only request changes to revisions you do '.
+          'not own.'));
+    }
+
+    if ($this->isViewerRejectingReviewer($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not request changes to this revision because you have '.
+          'already requested changes.'));
+    }
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s requested changes to this revision.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s requested changes to %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+}
diff --git a/src/applications/differential/xaction/DifferentialRevisionResignTransaction.php b/src/applications/differential/xaction/DifferentialRevisionResignTransaction.php
new file mode 100644
--- /dev/null
+++ b/src/applications/differential/xaction/DifferentialRevisionResignTransaction.php
@@ -0,0 +1,66 @@
+<?php
+
+final class DifferentialRevisionResignTransaction
+  extends DifferentialRevisionActionTransaction {
+
+  const TRANSACTIONTYPE = 'differential.revision.resign';
+  const ACTIONKEY = 'resign';
+
+  protected function getRevisionActionLabel() {
+    return pht('Resign as Reviewer');
+  }
+
+  protected function getRevisionActionDescription() {
+    return pht('You will resign as a reviewer for this change.');
+  }
+
+  public function getIcon() {
+    return 'fa-flag';
+  }
+
+  public function getColor() {
+    return 'orange';
+  }
+
+  public function generateOldValue($object) {
+    $actor = $this->getActor();
+    return !$this->isViewerAnyReviewer($object, $actor);
+  }
+
+  public function applyExternalEffects($object, $value) {
+    $status = DifferentialReviewerStatus::STATUS_RESIGNED;
+    $actor = $this->getActor();
+    $this->applyReviewerEffect($object, $actor, $value, $status);
+  }
+
+  protected function validateAction($object, PhabricatorUser $viewer) {
+    if ($object->isClosed()) {
+      throw new Exception(
+        pht(
+          'You can not resign from this revision because it has already '.
+          'been closed. You can only resign from open revisions.'));
+    }
+
+    if (!$this->isViewerAnyReviewer($object, $viewer)) {
+      throw new Exception(
+        pht(
+          'You can not resign from this revision because you are not a '.
+          'reviewer. You can only resign from revisions where you are a '.
+          'reviewer.'));
+    }
+  }
+
+  public function getTitle() {
+    return pht(
+      '%s resigned from this revision.',
+      $this->renderAuthor());
+  }
+
+  public function getTitleForFeed() {
+    return pht(
+      '%s resigned from %s.',
+      $this->renderAuthor(),
+      $this->renderObject());
+  }
+
+}