The 1990–91 Richmond Spiders men's basketball team represented the University of Richmond in National Collegiate Athletic Association (NCAA) Division I college basketball during the 1990–91 season.
Richmond competed as a member of the Colonial Athletic Association (CAA) under head basketball coach Dick Tarrant and played its home games at the Robins Center.
Richmond finished second in the CAA regular-season standings with a 10–4 conference record, and won the CAA tournament to earn an automatic bid to the 1991 NCAA tournament.
In the opening round, the Spiders became the first #15 seed to win an NCAA Tournament game.
They defeated the seventh-ranked, #2 seed Syracuse Orangemen, 73–69,[2][3] at Cole Field House in College Park, Maryland.