"Eight Days a Week" is a song by the English rock band the Beatles. It was written by Paul McCartney and John Lennon based on McCartney's original idea.
"Eight Days a Week" was released in the United Kingdom in December 1964 on the album Beatles for Sale. In the United States, it was first issued as a single in February 1965 before appearing on the North American release Beatles VI.
The song was the band's seventh number 1 single on the Billboard Hot 100, a run of US chart success achieved in just over a year. The single was also number 1 in Canada, Belgium and the Netherlands.
The Beatles recorded "Eight Days a Week" at EMI Studios in London in October 1964. The track opens with a fade-in, marking the first time that this technique had been used on a pop studio recording.
The song was reissued worldwide in 2000 on the Beatles compilation album 1. It also provided the title for director Ron Howard's 2016 documentary film on the band's years as live performers, The Beatles: Eight Days a Week.