Illinois, Ohio state, kansas, North Carolina
17 teams have gone undefeated in the regular season and of those only 1 (Indiana in 1976) has gone on to win the National Championship.
San Francisco, 1956 (29-0)
The last men's team to go undefeated during the regular season and win the tournament was Indiana in 1976.
The University of Utah
UNLV was undefeated in the regular season during the 1991 season, eventually losing to Duke in the NCAA tournament. Indiana University was the last team to go undefeated during the regular and post season. They were 32-0 in 1976.
Indiana University in 1976 under Bobby Knight. 32-0
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.