The 1990 NCAA Division I lacrosse tournament was the 20th annual tournament hosted by the National Collegiate Athletic Association to determine the team champion of men's college lacrosse among its Division I programs, held at the end of the 1990 NCAA Division I men's lacrosse season.

However, Syracuse's participation in the tournament was later vacated by the NCAA Committee on infractions because coach Roy Simmons, Jr.'s wife co-signed a car loan with Paul Gait.

as well as Paul Gait's 7 goals and 7 assists in this tournament, are not recognized by the NCAA.

Generally considered one of the best teams in NCAA lacrosse history, the 1990 Syracuse team is notable for finishing undefeated and featuring the Gait brothers—Paul and Gary Gait—and hall-of-famer Tom Marechek.

During the Gaits' four years at Syracuse, the team went 50–5 and won three straight national titles (one of which was vacated by the NCAA).