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
@@ -439,6 +439,8 @@
     'DifferentialDiffQuery' => 'applications/differential/query/DifferentialDiffQuery.php',
     'DifferentialDiffRepositoryHeraldField' => 'applications/differential/herald/DifferentialDiffRepositoryHeraldField.php',
     'DifferentialDiffRepositoryProjectsHeraldField' => 'applications/differential/herald/DifferentialDiffRepositoryProjectsHeraldField.php',
+    'DifferentialDiffSearchConduitAPIMethod' => 'applications/differential/conduit/DifferentialDiffSearchConduitAPIMethod.php',
+    'DifferentialDiffSearchEngine' => 'applications/differential/query/DifferentialDiffSearchEngine.php',
     'DifferentialDiffTestCase' => 'applications/differential/storage/__tests__/DifferentialDiffTestCase.php',
     'DifferentialDiffTransaction' => 'applications/differential/storage/DifferentialDiffTransaction.php',
     'DifferentialDiffTransactionQuery' => 'applications/differential/query/DifferentialDiffTransactionQuery.php',
@@ -5435,6 +5437,7 @@
       'HarbormasterBuildkiteBuildableInterface',
       'PhabricatorApplicationTransactionInterface',
       'PhabricatorDestructibleInterface',
+      'PhabricatorConduitResultInterface',
     ),
     'DifferentialDiffAffectedFilesHeraldField' => 'DifferentialDiffHeraldField',
     'DifferentialDiffAuthorHeraldField' => 'DifferentialDiffHeraldField',
@@ -5453,6 +5456,8 @@
     'DifferentialDiffQuery' => 'PhabricatorCursorPagedPolicyAwareQuery',
     'DifferentialDiffRepositoryHeraldField' => 'DifferentialDiffHeraldField',
     'DifferentialDiffRepositoryProjectsHeraldField' => 'DifferentialDiffHeraldField',
+    'DifferentialDiffSearchConduitAPIMethod' => 'PhabricatorSearchEngineAPIMethod',
+    'DifferentialDiffSearchEngine' => 'PhabricatorApplicationSearchEngine',
     'DifferentialDiffTestCase' => 'PhutilTestCase',
     'DifferentialDiffTransaction' => 'PhabricatorApplicationTransaction',
     'DifferentialDiffTransactionQuery' => 'PhabricatorApplicationTransactionQuery',
diff --git a/src/applications/differential/conduit/DifferentialDiffSearchConduitAPIMethod.php b/src/applications/differential/conduit/DifferentialDiffSearchConduitAPIMethod.php
new file mode 100644
--- /dev/null
+++ b/src/applications/differential/conduit/DifferentialDiffSearchConduitAPIMethod.php
@@ -0,0 +1,18 @@
+<?php
+
+final class DifferentialDiffSearchConduitAPIMethod
+  extends PhabricatorSearchEngineAPIMethod {
+
+  public function getAPIMethodName() {
+    return 'differential.diff.search';
+  }
+
+  public function newSearchEngine() {
+    return new DifferentialDiffSearchEngine();
+  }
+
+  public function getMethodSummary() {
+    return pht('Read information about diffs.');
+  }
+
+}
diff --git a/src/applications/differential/conduit/DifferentialQueryDiffsConduitAPIMethod.php b/src/applications/differential/conduit/DifferentialQueryDiffsConduitAPIMethod.php
--- a/src/applications/differential/conduit/DifferentialQueryDiffsConduitAPIMethod.php
+++ b/src/applications/differential/conduit/DifferentialQueryDiffsConduitAPIMethod.php
@@ -11,6 +11,16 @@
     return pht('Query differential diffs which match certain criteria.');
   }
 
+  public function getMethodStatus() {
+    return self::METHOD_STATUS_FROZEN;
+  }
+
+  public function getMethodStatusDescription() {
+    return pht(
+      'This method is frozen and will eventually be deprecated. New code '.
+      'should use "differential.diff.search" instead.');
+  }
+
   protected function defineParamTypes() {
     return array(
       'ids' => 'optional list<uint>',
diff --git a/src/applications/differential/query/DifferentialDiffQuery.php b/src/applications/differential/query/DifferentialDiffQuery.php
--- a/src/applications/differential/query/DifferentialDiffQuery.php
+++ b/src/applications/differential/query/DifferentialDiffQuery.php
@@ -6,6 +6,7 @@
   private $ids;
   private $phids;
   private $revisionIDs;
+  private $revisionPHIDs;
   private $commitPHIDs;
   private $hasRevision;
 
@@ -27,6 +28,11 @@
     return $this;
   }
 
+  public function withRevisionPHIDs(array $revision_phids) {
+    $this->revisionPHIDs = $revision_phids;
+    return $this;
+  }
+
   public function withCommitPHIDs(array $phids) {
     $this->commitPHIDs = $phids;
     return $this;
@@ -160,6 +166,25 @@
       }
     }
 
+    if ($this->revisionPHIDs !== null) {
+      $viewer = $this->getViewer();
+
+      $revisions = id(new DifferentialRevisionQuery())
+        ->setViewer($viewer)
+        ->setParentQuery($this)
+        ->withPHIDs($this->revisionPHIDs)
+        ->execute();
+      $revision_ids = mpull($revisions, 'getID');
+      if (!$revision_ids) {
+        throw new PhabricatorEmptyQueryException();
+      }
+
+      $where[] = qsprintf(
+        $conn,
+        'revisionID IN (%Ls)',
+        $revision_ids);
+    }
+
     return $where;
   }
 
diff --git a/src/applications/differential/query/DifferentialDiffSearchEngine.php b/src/applications/differential/query/DifferentialDiffSearchEngine.php
new file mode 100644
--- /dev/null
+++ b/src/applications/differential/query/DifferentialDiffSearchEngine.php
@@ -0,0 +1,79 @@
+<?php
+
+final class DifferentialDiffSearchEngine
+  extends PhabricatorApplicationSearchEngine {
+
+  public function getResultTypeDescription() {
+    return pht('Differential Diffs');
+  }
+
+  public function getApplicationClassName() {
+    return 'PhabricatorDifferentialApplication';
+  }
+
+  public function newQuery() {
+    return new DifferentialDiffQuery();
+  }
+
+  protected function buildQueryFromParameters(array $map) {
+    $query = $this->newQuery();
+
+    if ($map['revisionPHIDs']) {
+      $query->withRevisionPHIDs($map['revisionPHIDs']);
+    }
+
+    return $query;
+  }
+
+  protected function buildCustomSearchFields() {
+    return array(
+      id(new PhabricatorPHIDsSearchField())
+        ->setLabel(pht('Revisions'))
+        ->setKey('revisionPHIDs')
+        ->setAliases(array('revision', 'revisions', 'revisionPHID'))
+        ->setDescription(
+          pht('Find diffs attached to a particular revision.')),
+    );
+  }
+
+  protected function getURI($path) {
+    return '/differential/diff/'.$path;
+  }
+
+  protected function getBuiltinQueryNames() {
+    $names = array();
+
+    $names['all'] = pht('All Diffs');
+
+    return $names;
+  }
+
+  public function buildSavedQueryFromBuiltin($query_key) {
+    $query = $this->newSavedQuery();
+    $query->setQueryKey($query_key);
+
+    $viewer = $this->requireViewer();
+
+    switch ($query_key) {
+      case 'all':
+        return $query;
+    }
+
+    return parent::buildSavedQueryFromBuiltin($query_key);
+  }
+
+  protected function renderResultList(
+    array $revisions,
+    PhabricatorSavedQuery $query,
+    array $handles) {
+    assert_instances_of($revisions, 'DifferentialDiff');
+
+    $viewer = $this->requireViewer();
+
+    // NOTE: This is only exposed to Conduit, so we don't currently render
+    // results.
+
+    return id(new PhabricatorApplicationSearchResultView());
+  }
+
+}
diff --git a/src/applications/differential/storage/DifferentialDiff.php b/src/applications/differential/storage/DifferentialDiff.php
--- a/src/applications/differential/storage/DifferentialDiff.php
+++ b/src/applications/differential/storage/DifferentialDiff.php
@@ -9,7 +9,8 @@
     HarbormasterCircleCIBuildableInterface,
     HarbormasterBuildkiteBuildableInterface,
     PhabricatorApplicationTransactionInterface,
-    PhabricatorDestructibleInterface {
+    PhabricatorDestructibleInterface,
+    PhabricatorConduitResultInterface {
 
   protected $revisionID;
   protected $authorPHID;
@@ -740,4 +741,82 @@
     $this->saveTransaction();
   }
 
+
+/* -(  PhabricatorConduitResultInterface  )---------------------------------- */
+
+
+  public function getFieldSpecificationsForConduit() {
+    return array(
+      id(new PhabricatorConduitSearchFieldSpecification())
+        ->setKey('revisionPHID')
+        ->setType('phid')
+        ->setDescription(pht('Associated revision PHID.')),
+      id(new PhabricatorConduitSearchFieldSpecification())
+        ->setKey('authorPHID')
+        ->setType('phid')
+        ->setDescription(pht('Revision author PHID.')),
+      id(new PhabricatorConduitSearchFieldSpecification())
+        ->setKey('repositoryPHID')
+        ->setType('phid')
+        ->setDescription(pht('Associated repository PHID.')),
+      id(new PhabricatorConduitSearchFieldSpecification())
+        ->setKey('refs')
+        ->setType('map<string, wild>')
+        ->setDescription(pht('List of related VCS references.')),
+    );
+  }
+
+  public function getFieldValuesForConduit() {
+    $refs = array();
+
+    $branch = $this->getBranch();
+    if (strlen($branch)) {
+      $refs[] = array(
+        'type' => 'branch',
+        'name' => $branch,
+      );
+    }
+
+    $onto = $this->loadTargetBranch();
+    if (strlen($onto)) {
+      $refs[] = array(
+        'type' => 'onto',
+        'name' => $onto,
+      );
+    }
+
+    $base = $this->getSourceControlBaseRevision();
+    if (strlen($base)) {
+      $refs[] = array(
+        'type' => 'base',
+        'identifier' => $base,
+      );
+    }
+
+    $bookmark = $this->getBookmark();
+    if (strlen($bookmark)) {
+      $refs[] = array(
+        'type' => 'bookmark',
+        'name' => $bookmark,
+      );
+    }
+
+    $revision_phid = null;
+    if ($this->getRevisionID()) {
+      $revision_phid = $this->getRevision()->getPHID();
+    }
+
+    return array(
+      'revisionPHID' => $revision_phid,
+      'authorPHID' => $this->getAuthorPHID(),
+      'repositoryPHID' => $this->getRepositoryPHID(),
+      'refs' => $refs,
+    );
+  }
+
+  public function getConduitSearchAttachments() {
+    return array();
+  }
+
+
 }