The 1990–91 Saint Peter's Peacocks men's basketball team represented Saint Peter's College during the 1990–91 NCAA Division I men's basketball season.

The Peacocks, led by fifth-year head coach Ted Fiore, played their home games at the Yanitelli Center and were members of the Metro Atlantic Athletic Conference.

They defeated Niagara, La Salle, and Iona to win the MAAC tournament.

As a result, they received the conference's automatic bid to the NCAA tournament – the first in school history[1] – as the No.

12 seed in the Midwest region where they lost to Texas in the first round.