"That'll Be the Day" is a song written by Buddy Holly and Jerry Allison. It was first recorded by Buddy Holly and the Three Tunes in 1956 and was re-recorded in 1957 by Holly and his new band, the Crickets. The 1957 recording achieved widespread success. Holly's producer, Norman Petty, was credited as a co-writer, although he did not contribute to the composition.

Cover versions have been recorded by various artists. It was the first song recorded (as a demonstration disc) by the Quarrymen, the skiffle group that evolved into the Beatles.

The 1957 recording was certified gold (for over a million US sales) by the Recording Industry Association of America (RIAA) in 1969. It was inducted into the Grammy Hall of Fame in 1998. It was placed in the National Recording Registry, a list of sound recordings that "are culturally, historically, or aesthetically important, and/or inform or reflect life in the United States", in 2005.

In June 1956, Holly, Allison and Sonny Curtis went to see the movie The Searchers, starring John Wayne, in which Wayne repeatedly used the phrase "that'll be the day". This line of dialogue inspired the young musicians.

The song was first recorded by Buddy Holly and the Three Tunes for Decca Records at Bradley’s Barn, in Nashville, on July 22, 1956. Decca, displeased with Holly's previous two singles, did not issue recordings from this session. After the song was re-recorded by the Crickets in 1957 and became a hit, Decca released the original recording as a single (Decca D30434) on September 2, 1957, with "Rock Around with Ollie Vee" as the B-side. It was also the title track of the 1958 album That'll Be the Day. Despite Holly's newfound stardom, the single did not chart.

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