The 1990–91 season of the Moroccan Throne Cup was the 35th edition of the competition.
Kawkab Marrakech won the cup, beating KAC Kénitra 2–1 in the final, played at the Prince Moulay Abdellah Stadium in Rabat. Kawkab Marrakech won the competition for the fifth time in their history.
Competition Last 16 Team 1 Team 2 Result Kawkab Marrakech Fath Union Sport 4–1 Raja de Beni Mellal Mouloudia Club d'Oujda 2–3 Hilal de Nador TAS de Casablanca 2–4 Raja Club Athletic Crédit agricole Rabat 2–0 Wydad Athletic Club Olympique de Casablanca 2–0 Maghreb de Fès Renaissance de Settat 3–2 Chabab Mohammédia KAC Kénitra 0–1 Olympique de Khouribga FAR de Rabat 0–1
Quarter-finals Team 1 Team 2 Result Kawkab Marrakech Mouloudia Club d'Oujda 2–1 KAC Kénitra Raja Club Athletic 2–1Match replayed after 0–0 draw Wydad Athletic Club TAS de Casablanca 1–2 Maghreb de Fès FAR de Rabat 2–1
Semi-finals Team 1 Team 2 Result Kawkab Marrakech Tihad Sportif Casablanca 1–0 Maghreb de Fès KAC Kénitra 1–2
Final The final took place between the two winning semi-finalists, Kawkab Marrakech and KAC Kénitra, at the Prince Moulay Abdellah Stadium in Rabat.
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