Jan Michael van Breda Kolff (born December 16, 1951) is an American former college and professional basketball player and college basketball head coach. The son of coaching great Butch van Breda Kolff, V.B.K., as he was referred to, played from 1975 to 1983 for the Denver Nuggets, Kentucky Colonels, and Virginia Squires in the American Basketball Association, and the New York/New Jersey Nets in the National Basketball Association. From 1970-74 he played for Vanderbilt University, and in 1974 he led the Commodores to a Southeastern Conference championship as SEC Player of the Year.
He also spent two years in Italy, from 1983 to 1985, helping Italian team Virtus Bologna win a championship.
Van Breda Kolff's tenure at St. Bonaventure ended abruptly in controversy late in the 2002-03 season. St. Bonaventure admitted junior college transfer Jamil Terrell with only a welding certificate in lieu of necessary academic credentials. Athletic director Gothard Lane had told school president Robert Wickenheiser in no uncertain terms that Terrell was ineligible. However, Wickenheiser, under prodding from his son Kort, who was also one of Van Breda Kolff's assistants, unilaterally declared Terrell eligible. School officials didn't seek guidance from the NCAA about Terrell's eligibility until the 2002-03 season was nearly over. The Bonnies were forced to forfeit every game in which Terrell played, and were also barred from the Atlantic 10 Conference tournament. In protest, the Bonnies players opted to sit out the last two games. Van Breda Kolff denied knowing about the scandal, and was cleared of wrongdoing.
On April 25, 2007, he was named as one of three finalists to become the new head coach of UC Riverside's men's basketball program.
Van Breda Kolff was named coach of the Nashville Broncos of the American Basketball Association in 2008. He stayed with the team through its name change to the Music City Stars, but lost his job when the team disbanded in 2010.