"I Should Have Known Better" is a song by English rock band the Beatles composed by John Lennon (credited to Lennon–McCartney), and originally issued on A Hard Day's Night, their soundtrack for the film of the same name released July 10, 1964. I Should Have Known Better was issued as the B-side of the U.S. single A Hard Day's Night released July 13, 1964. An orchestrated version of the song conducted by George Martin appears on the North American version of the album, A Hard Day's Night Original Motion Picture Soundtrack.