diff --git a/src/wp-includes/feed.php b/src/wp-includes/feed.php
index 421bee71730d1..b796843d43e86 100644
--- a/src/wp-includes/feed.php
+++ b/src/wp-includes/feed.php
@@ -832,6 +832,19 @@ function fetch_feed( $url ) {
 
 	$feed->get_registry()->register( SimplePie\File::class, 'WP_SimplePie_File', true );
 
+	if ( is_array( $url ) && count( $url ) <= 1 ) {
+		$url = array_shift( $url );
+	} elseif ( is_array( $url ) ) {
+		$feeds = array();
+		foreach ( (array) $url as $feed_url ) {
+			$feeds[] = fetch_feed( $feed_url );
+		}
+		$items = SimplePie\SimplePie::merge_items( $feeds );
+		$feed->init();
+		$feed->data['items'] = $items;
+		return $feed;
+	}
+
 	$feed->set_feed_url( $url );
 	/** This filter is documented in wp-includes/class-wp-feed-cache-transient.php */
 	$feed->set_cache_duration( apply_filters( 'wp_feed_cache_transient_lifetime', 12 * HOUR_IN_SECONDS, $url ) );
diff --git a/tests/phpunit/tests/feed/fetchFeed.php b/tests/phpunit/tests/feed/fetchFeed.php
index 71ed1650e717a..9b191747d3e2f 100644
--- a/tests/phpunit/tests/feed/fetchFeed.php
+++ b/tests/phpunit/tests/feed/fetchFeed.php
@@ -33,6 +33,28 @@ public function test_empty_charset_does_not_trigger_fatal_error() {
 		$this->assertStringContainsString( '<a href="https://learn.wordpress.org/">Learn WordPress</a> is a learning resource providing workshops, quizzes, courses, lesson plans, and discussion groups so that anyone, from beginners to advanced users, can learn to do more with WordPress.', $content );
 	}
 
+	/**
+	 * Ensure fetch_feed() accepts multiple feeds.
+	 *
+	 * The main purpose of this test is to ensure that the SimplePie deprecation warning
+	 * is not thrown when requesting multiple feeds.
+	 *
+	 * Secondly it confirms that the markup of the first two items match as they will
+	 * both be from the same feed URL as the array contains the WordPress News feed twice.
+	 *
+	 * @ticket 64136
+	 */
+	public function test_fetch_feed_supports_multiple_feeds() {
+		$feed    = fetch_feed( array( 'https://wordpress.org/news/feed/', 'https://wordpress.org/news/feed/' ) );
+		$content = array();
+
+		foreach ( $feed->get_items( 0, 2 ) as $item ) {
+			$content[] = $item->get_content();
+		}
+
+		$this->assertEqualHTML( $content[0], $content[1], null, 'The contents of the first two items should be identical.' );
+	}
+
 	/**
 	 * Ensure that fetch_feed() is cached on second and subsequent calls.
 	 *