The 1989–90 season of the Moroccan Throne Cup was the 34th edition of the competition. Olympique de Casablanca won the cup, beating FAR de Rabat 4–2 on penalties after a 0–0 draw in the final, played at the Prince Moulay Abdellah Stadium in Rabat. Olympique de Casablanca won the competition for the first time in their history.