Alexander Constantine Dyer (born 14 November 1965, in Forest Gate, Greater London) is an English former footballer who is assistant manager of the Scottish national team and Kilmarnock FC.
Dyer played mainly as a defender (but who could also play in midfield) for eleven clubs in a seventeen-year professional career.
His achievements as a player including helping Blackpool win promotion to the Third Division in 1985 and Crystal Palace to the First Division in 1989.