Alexander Constantine Dyer (born 14 November 1965) is an English football coach and former player who was most recently the assistant at Greece Super League club Aris.
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.