Ian Donaldson Johnstone (2 March 1939 - 1993) was a Scottish footballer who played in the Football League as a forward for Colchester United.
Born in Galashiels, Johnstone joined Scottish amateur club Ormiston Primrose as a youth, earning a move to Colchester United in the 1958-59 season. He played two games in the Football League for the U's, making his debut in a 1-0 home victory against Chesterfield on 18 April 1959 and made his final appearance on 29 August 1959 in a 2-2 draw with Barnsley at Layer Road. He later played for Clacton Town. Ian Johnstone died in 1993.