"Mean Mr. Mustard" is a song by English rock band the Beatles, released on their 1969 studio album Abbey Road.

[1] The song was written during the Beatles' stay in India; Lennon said that it was inspired by a newspaper story about a miser who concealed his cash wherever he could in order to prevent people from forcing him to spend it.

"[4] As eventually recorded, "Mustard" originally was to end in the chord of D major—this would have led into the next track in the climactic medley, "Her Majesty".

The complete version of "Mustard" (with its original clean ending) can be heard on The Beatles: Rock Band video game, as well as Abbey Road's 2019 Super Deluxe Edition.

A newspaper article from the 7 June 1967 Daily Record with the headline "A Mean Husband Shaved in the Dark" features a man called John Mustard, who lived in Enfield, Middlesex.