ohio state
That would be a tie between schools including UNLV, Baylor, and Kansas. Contrary to the last answer, Kentucky does not lead in this category, and in fact had only one serious case of an infraction in the Mills incident. The University has not suffered any other major infraction.
Stanford with 6 NCAA Titles (1992, 1994, 1996, 1997, 2001, 2004)
As of October 2023, Ohio State University has had a total of 16 major NCAA violations in its athletic history. These violations span various sports and date back several decades, with notable cases including issues related to football and basketball programs. The most significant recent violation occurred in 2011, related to improper benefits received by football players. Ohio State has since implemented measures to improve compliance and oversight within its athletic programs.
Oregon
That depends on what you mean by NCAA. The Wisconsin Badgers have been to the NCAA Tournament 18 times. Their most recent appearance was in the Sweet Sixteen in 2012. The Badgers have not won the NCAA Tournament since 1941.
Florida
bama...hands down. 16 different teams at the same time for 3 years....18 consecutive years...some of the most egregious violations ever brought before the SEC. Bama NCAA violations make most other schools' look like jaywalkers.
FSU
uconn
big ten
University of southern California