1997–98 Princeton Tigers men's basketball team

The 1997–98 Princeton Tigers men's basketball team represented Princeton University in intercollegiate college basketball during the 1997–98 NCAA Division I men's basketball season. The head coach was Bill Carmody and the team co-captains were Steve Goodrich and Mitch Henderson. The team played its home games in the Jadwin Gymnasium on the University campus in Princeton, New Jersey, and was the repeat undefeated champion of the Ivy League, which earned them an invitation to the 64-team 1998 NCAA Men's Division I Basketball Tournament where they were seeded fifth in the East Region and advanced to the second round. Over the course of the season, the team achieved the highest winning percentage in the nation (93.1%, 27–2). It also established the current school record of 20 consecutive wins surpassing the 19-game streak achieved twice, including the prior season.

Using the Princeton offense, the team posted a 27–2 overall record and a 14–0 conference record. The team entered the tournament on a 19-game winning streak. In a March 12, 1998 NCAA Men's Division I Basketball Tournament East Regional first round game at the Hartford Civic Center in Hartford, Connecticut, the fifth-seeded Tigers defeated UNLV Runnin' Rebels 69–57. Then two days later in the second round the team lost to the Michigan State Spartans 63–56.