"Peacekeeper" is a song by Fleetwood Mac, written by guitarist and vocalist Lindsey Buckingham, from the 2003 album Say You Will. It was the first and most commercially successful single released from the album. This was also the band's 25th, and most recent song to debut in the U.S. Billboard Hot 100. This was also Buckingham's first US hit since "Family Man", which peaked at #90 in 1988.