John Mellor (born July 1906, date of death unknown) was an English footballer who played as a full back in the Football League for Manchester United and Cardiff City. He was born in Oldham, Lancashire. In his early days, he played for Witton Albion.^[1] In June 1929, he was sold to Manchester United, where he made 122 appearances without scoring. He stayed with United until 1937 when he was sold to Cardiff City.^[2] He made his Cardiff debut in an 8–1 defeat of Luton Town and stayed for two seasons before being forced to retire from injury.^{[citation needed]}