The last men's team to go undefeated during the regular season and win the tournament was Indiana in 1976.
Indiana
It has never been done.
UNLV 1991
South Carolina is the only school to ever go undefeated in the ACC regular season. They did it in the 1969-1970 season under Frank Mcguire and went to the Sweet 16 that year.
Answer The University of Memphis has a basketball team that is going to play in the "Final Four" playoffs. They went undefeated during the regular season for 19 straight games.
Villanova
1954
During the 2007 season they went undefeated in the regular season before the New York Giants beat them in the Super Bowl
San Francisco, 1956 (29-0)
Three times the uconn womens basketball team went through a season undefeated.
1975-1976 Indiana. 32-0. Actually there was another team that went undefeated and won a NCAA basketball national championship. It was in 1996. Fort Hays State of Hays, KS went undefeated in the regular season and post season. Winning the NCAA Div 2 national championship. Sure, it's div. 2, but an undefeated college basketball season is so infrequent, at any level, it should be recognized.