"A Hard Day's Night" is a song by the English rock band The Beatles. Written by John Lennon, and credited to Lennon–McCartney, it was released on the movie soundtrack of the same name in 1964. It was later released as a single, with "Things We Said Today" as its B-side.

The song featured prominently on the soundtrack to The Beatles' first feature film, A Hard Day's Night, and was on their album of the same name. The song topped the charts in both the United Kingdom and United States when it was released as a single. Featuring a prominent and unique openingchord, the song's success demonstrated that The Beatles were not a one-hit wonder in the US.

The American and British singles of "A Hard Day's Night" as well as both the American and British albums of the same title all held the top position in their respective charts for a couple of weeks in August 1964, the first time any artist had accomplished this feat.

"A Hard Day's Night" was first released to the United States, coming out on 26 June 1964 on the album A Hard Day's Night, the soundtrack to the film, and released by United Artists. It was the first song to be released before single release."A Hard Day's Night" was the first Beatles single released in the UK not to use a pronoun in its title, following "Love Me Do", "Please Please Me", "From Me to You." "She Loves You", "I Want to Hold Your Hand", and "Can't Buy Me Love".

The lyrics speak about the singer's undying devotion to his lover, and how he toils so she can purchase the items she fancies. The singer sings about his tiredness when he comes home from work, but how the things that his lover does perk him up.

On the day the song was written, Lennon is purported to have shown reporter Maureen Cleave of London's Evening Standard the lyrics, and she said that word "tiredness" sounded weak in the line "I find my tiredness is through/And I feel alright." Lennon subsequently replaced the lines in question with "I find the things that you do/They make me feel all right"