The 1990–91 Cypriot Fourth Division was the 6th season of the Cypriot fourth-level football league. The championship was split into three geographical groups, representing the Districts of Cyprus. The winners were: * Nicosia-Keryneia Group: AEK Kakopetrias * Larnaca-Famagusta Group: Achyronas Liopetriou * Limassol-Paphos Group: Kentro Neotitas Maroniton The three winners were promoted to the 1991–92 Cypriot Third Division. Seven teams were relegated to regional leagues.