diff --git src/wp-includes/feed-rss2-comments.php src/wp-includes/feed-rss2-comments.php
index d6137bac41..95bffde501 100644
--- src/wp-includes/feed-rss2-comments.php
+++ src/wp-includes/feed-rss2-comments.php
@@ -33,16 +33,26 @@ do_action( 'rss_tag_pre', 'rss2-comments' );
 >
 <channel>
 	<title><?php
+		$page_title = '';
 		if ( is_singular() ) {
 			/* translators: Comments feed title. 1: Post title */
-			printf( ent2ncr( __( 'Comments on: %s' ) ), get_the_title_rss() );
+			$page_title = sprintf( ent2ncr( __( 'Comments on: %s' ) ), get_the_title_rss() );
 		} elseif ( is_search() ) {
 			/* translators: Comments feed title. 1: Site name, 2: Search query */
-			printf( ent2ncr( __( 'Comments for %1$s searching on %2$s' ) ), get_bloginfo_rss( 'name' ), get_search_query() );
+			$page_title = sprintf( ent2ncr( __( 'Comments for %1$s searching on %2$s' ) ), get_bloginfo_rss( 'name' ), get_search_query() );
 		} else {
 			/* translators: Comments feed title. 1: Site name */
-			printf( ent2ncr( __( 'Comments for %s' ) ), get_wp_title_rss() );
+			$page_title = sprintf( ent2ncr( __( 'Comments for %s' ) ), get_bloginfo_rss( 'name' ) . get_wp_title_rss() );
 		}
+
+		/**
+		 * Filter the page title for the RSS2 comments feed.
+		 *
+		 * @since 4.9
+		 *
+		 * @param string $page_title RSS2 comments feed page title.
+		 */
+		echo apply_filters( 'rss_comments_page_title', $page_title, get_the_title_rss() );
 	?></title>
 	<atom:link href="<?php self_link(); ?>" rel="self" type="application/rss+xml" />
 	<link><?php (is_single()) ? the_permalink_rss() : bloginfo_rss("url") ?></link>
@@ -72,16 +82,27 @@ do_action( 'rss_tag_pre', 'rss2-comments' );
 	?>
 	<item>
 		<title><?php
+			$item_title = '';
 			if ( !is_singular() ) {
 				$title = get_the_title($comment_post->ID);
 				/** This filter is documented in wp-includes/feed.php */
 				$title = apply_filters( 'the_title_rss', $title );
 				/* translators: Individual comment title. 1: Post title, 2: Comment author name */
-				printf(ent2ncr(__('Comment on %1$s by %2$s')), $title, get_comment_author_rss());
+				$item_title = sprintf( ent2ncr( __( 'Comment on %1$s by %2$s' ) ), $title, get_comment_author_rss() );
 			} else {
 				/* translators: Comment author title. 1: Comment author name */
-				printf(ent2ncr(__('By: %s')), get_comment_author_rss());
+				$item_title = sprintf( ent2ncr( __( 'By: %s' ) ), get_comment_author_rss() );
 			}
+
+			/**
+			 * Filter the title to use for an item in an RSS2 comments feed.
+			 *
+			 * @since 4.9
+			 *
+			 * @param string $item_title   RSS2 comments feed item title.
+			 * @param object $comment_post Comment post object.
+			 */
+			echo apply_filters( 'rss_comments_item_title', $item_title, $comment_post );
 		?></title>
 		<link><?php comment_link() ?></link>
 		<dc:creator><![CDATA[<?php echo get_comment_author_rss() ?>]]></dc:creator>