UAAP Season 54 men's basketball tournament
| Host school | University of the Philippines | ||||||||||||
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| Duration | October 5–12, 1991 | ||||||||||||
| Arena(s) | Araneta Coliseum | ||||||||||||
| Winning coach | Arturo Valenzona | ||||||||||||
| TV network(s) | Silverstar Sports (New Vision 9) | ||||||||||||
The 1991 UAAP men's basketball tournament was the 54th year of the men's tournament of the University Athletic Association of the Philippines (UAAP)'s basketball championship. Hosted by University of the Philippines. The season opens on July 20 at the Araneta Coliseum. The year's theme "Ang UAAP sa Siglo 2000: Palaro'y Paunlarin, Pagkatao'y Pagtibayin" signifies the UAAP's efforts at strengthening the values of healthy competition, friendship and sportsmanship in the pursuit of physical excellence.
Far Eastern University won their first title since 1983 and 12th overall on October 12 when De La Salle University did not show up in the ordered replay of their entire championship match from the first to fourth quarter, despite La Salle winning the only contested game by three points. The UAAP Board order happened right after the celebration of winning the championship game. The UAAP Board had a lone dissenter against the cries of FEU, Fr. Raymond Holscher, S.J. of the Ateneo de Manila University, another Catholic university like La Salle.