While still a player, Mitten was appointed player-coach of Mansfield Town. Mitten joined the club in February 1956 and remained there for over two years until June 1958. He played 100 league games, scoring 25 league goals. His reign was a success and Mitten's side was praised for their entertaining football. In the 1957–58 season, his side scored 100 goals in League. In his biography, Mitten stated: "The Mansfield job was the best I ever had in football". At Mansfield, he also gave a debut his 16-year-old son, John, who later went on to play for a number of clubs, including Coventry City.