"Peace Train" is a 1971 song by Cat Stevens, taken from his album Teaser and the Firecat. The song climbed to No. 7 on the Billboard Hot 100 chart during the week of November 6, 1971, becoming Stevens' first US Top 10 hit. The song also spent three weeks at No. 1 on the adult contemporary chart. It is also featured on The Very Best of Cat Stevens compilation album. He re-recorded the song for the charity War Child in 2003.

Record World called it a "beautiful follow-up to 'Moon Shadow' and 'Wide World' [sic]" and praised the "delightful production."

In the album version, the instrumental ending features a string section which drops out leaving the solo acoustic guitar playing of Cat Stevens, before the song's fade.

In a 1970s concert he introduced the song with the revelation that he wrote the song whilst on a train, and was thinking about Alfred Hitchcock, no doubt reflecting the fact that many of Alfred Hitchcock's film plots were set on trains.

Cat Stevens later converted to Islam, changed his name to Yusuf Islam, and reduced his public appearances, but during the Iraq War he commented on the song's renewed relevance, saying: "'Peace Train' is a song I wrote, the message of which continues to breeze thunderously through the hearts of millions. There is a powerful need for people to feel that gust of hope rise up again. As a member of humanity and as a Muslim, this is my contribution to the call for a peaceful solution."

Yusuf Islam performed the song live at the 2006 Nobel Peace Prize Concert ceremony when Muhammad Yunus of Bangladesh received the award. The interlude during the song where the background singers chant "Kumbayaba" was removed for this version. He also performed the song as part of a comedic skit at Jon Stewart's Rally to Restore Sanity, and at the New Zealand national remembrance service for the Christchurch mosque shootings, held at Hagley Park on 29 March 2019.

Teaming up with Playing for Change, in 2021 Yusuf/Cat Stevens recorded a new version of "Peace Train" with over 25 musicians from 12 countries.

Pop songs with messages of peace were common in the Vietnam War era, and "Peace Train" was preceded by "Give Peace a Chance" in 1969. Not everyone found Cat Stevens's peace-themed song convincing, however. Robert Christgau criticized "Peace Train's" message in his November 1972 Newsday review of a concert by Stevens at the New York Philharmonic Hall: "I don't mind when Johnny Nash sings a charming ditty about how things are getting better, but when Stevens informs the world that we're all on a peace train, I get annoyed. We're not, and if Stevens ever stops shaking his head long enough to see clearly for a second, he might realize it."