"Happy Xmas (War Is Over)" is a 1971 Christmas song released as a single by the Plastic Ono Band with the Harlem Community Choir. It was the seventh single issued by John Lennon outside his work with the Beatles. The song reached number four in the United Kingdom, where its release was delayed until November 1972, and has periodically returned to the UK Singles Chart, most notably after Lennon's murder in December 1980, when it peaked at number two.