diff --git a/src/wp-includes/class-wp-comment-query.php b/src/wp-includes/class-wp-comment-query.php
index 01048e6a3f..ec35a2adac 100644
--- a/src/wp-includes/class-wp-comment-query.php
+++ b/src/wp-includes/class-wp-comment-query.php
@@ -94,6 +94,7 @@ class WP_Comment_Query {
 	 *
 	 * @since 4.2.0
 	 * @since 4.4.0 `$parent__in` and `$parent__not_in` were added.
+	 * @since 4.4.0 Order by `comment__in` was added.
 	 * @access public
 	 *
 	 * @param string|array $query {
@@ -130,7 +131,7 @@ class WP_Comment_Query {
 	 *                                             'comment_author_url', 'comment_content', 'comment_date',
 	 *                                             'comment_date_gmt', 'comment_ID', 'comment_karma',
 	 *                                             'comment_parent', 'comment_post_ID', 'comment_type', 'user_id',
-	 *                                             'meta_value', 'meta_value_num', the value of $meta_key, and the
+	 *                                             'comment__in', 'meta_value', 'meta_value_num', the value of $meta_key, and the
 	 *                                             array keys of `$meta_query`. Also accepts false, an empty array,
 	 *                                             or 'none' to disable `ORDER BY` clause.
 	 *                                             Default: 'comment_date_gmt'.
@@ -390,7 +391,7 @@ class WP_Comment_Query {
 					$_order = $_value;
 				}
 
-				if ( ! $found_orderby_comment_ID && 'comment_ID' === $_orderby ) {
+				if ( ! $found_orderby_comment_ID && in_array( $_orderby, array( 'comment_ID', 'comment__in' ) ) ) {
 					$found_orderby_comment_ID = true;
 				}
 
@@ -400,6 +401,11 @@ class WP_Comment_Query {
 					continue;
 				}
 
+				if ( 'comment__in' === $_orderby ) {
+					$orderby_array[] = $parsed;
+					continue;
+				}
+
 				$orderby_array[] = $parsed . ' ' . $this->parse_order( $_order );
 			}
 
@@ -772,6 +778,9 @@ class WP_Comment_Query {
 			$parsed = "$wpdb->commentmeta.meta_value";
 		} elseif ( $orderby == 'meta_value_num' ) {
 			$parsed = "$wpdb->commentmeta.meta_value+0";
+		} elseif ( $orderby == 'comment__in' ) {
+			$comment__in = implode( ',', array_map( 'absint', $this->query_vars['comment__in'] ) );
+			$parsed = "FIELD( {$wpdb->comments}.comment_ID, $comment__in )";
 		} elseif ( in_array( $orderby, $allowed_keys ) ) {
 
 			if ( isset( $meta_query_clauses[ $orderby ] ) ) {
diff --git a/tests/phpunit/tests/comment/query.php b/tests/phpunit/tests/comment/query.php
index 7356541ef4..cecf92cf0a 100644
--- a/tests/phpunit/tests/comment/query.php
+++ b/tests/phpunit/tests/comment/query.php
@@ -1837,4 +1837,38 @@ class Tests_Comment_Query extends WP_UnitTestCase {
 
 		$this->assertEqualSets( array( $c1, $c2 ), $ids->comments );
 	}
+
+	/**
+	 * @ticket 33883
+	 */
+	public function test_orderby_comment__in() {
+		$this->factory->comment->create( array(
+			'comment_post_ID' => $this->post_id,
+			'comment_approved' => '1'
+		) );
+
+		$c2 = $this->factory->comment->create( array(
+			'comment_post_ID' => $this->post_id,
+			'comment_approved' => '1'
+		) );
+		$c3 = $this->factory->comment->create( array(
+			'comment_post_ID' => $this->post_id,
+			'comment_approved' => '1'
+		) );
+
+		$this->factory->comment->create( array(
+			'comment_post_ID' => $this->post_id,
+			'comment_approved' => '1'
+		) );
+
+
+		$ids = new WP_Comment_Query( array(
+			'fields' => 'ids',
+			'comment__in' => array( $c2, $c3 ),
+			'orderby' => 'comment__in'
+		) );
+
+		$this->assertEquals( array( $c2, $c3 ), $ids->comments );
+
+	}
 }