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.
Competition Last 16 Team 1 Team 2 Result Najah Souss Difaâ Hassani El Jadidi 0–2 Union de Sidi Kacem Amal Club de Belksiri 2–0 Raja Club Athletic Fath Union Sport 1–0 Maghreb de Fès Ittihad Khemisset 1–2 FAR Rabat Chabab Mohammédia 3–0Match replayed after 1–1 draw Olympique de Khouribga Renaissance de Settat 2–1 KAC Kénitra Tihad Sportif Casablanca 4–1 Olympique de Casablanca AS Salé 1–0
Quarter-finals Team 1 Team 2 Result Union de Sidi Kacem Difaâ Hassani El Jadidi 1–0 Raja Club Athletic FAR de Rabat 0–4 KAC Kénitra Olympique de Khouribga 0–1 Olympique de Casablanca Ittihad Khemisset 3–1
Semi-finals Team 1 Team 2 Result Olympique de Casablanca Olympique de Khouribga 0–05–3 (pens) Union de Sidi Kacem FAR de Rabat 0–4
Final The final took place between the two winning semi-finalists, Olympique de Casablanca and FAR de Rabat, on 18 September 1990 at the Prince Moulay Abdellah Stadium in Rabat.
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