1991 NCAA Division I Men's Swimming and Diving Championships

The 1991 NCAA Division I Men's Swimming and Diving Championships were contested in March 1991 at the Texas Swimming Center at the University of Texas in Austin, Texas at the 68th annual NCAA-sanctioned swim meet to determine the team and individual national champions of Division I men's collegiate swimming and diving in the United States.

Hosts Texas topped the team standings, the Longhorns' fourth consecutive and fifth overall men's title.

Team standings

 * Note: Top 10 only
 * (H) = Hosts
 * (DC) = Defending champions
 * Full results