The 1990–91 Primera División de Fútbol Profesional season is the 39th tournament of El Salvador's Primera División since its establishment of the National League system in 1948.
Luis Angel Firpo won the championship match against Aguila 1-0.
Prior to the start of 1990-91 season, Acajutla changed their names to Tiburones FC (the sharks).
They also changed their team colour from red to white and orange.
Luis Ángel Firpo Fuerte San Francisco Metapan Tiburones