Larry Kehres, of Mount Union College, Division III, with 10 national championships.
(If you meant Division I-FBS, the answer is Paul "Bear" Bryant, no matter how you slice it. So please don't clutter this answer with a bunch of also-rans who came CLOSE to having as many as Bryant. The Bear is the King.)
Larry Kehres, of Mount Union College, Division III, with 9 national championships.
Urban Meyer (2006 & 2008)
Charlie Weis, tied with many others: zero.
Coach K, of Duke. I believe...
Nick Saban of Alabama.
Coach McDonnell to retire after earning 42 national titles
Paul Brown was an American Football coach. He was the coach in the All-America Football Conference and National Football League.His teams won seven league championships.
If we restrict it to AP/Coaches poll and/ or BCS National Championships for division one college football since 1950 then the breakdown is as follows:BEAR BRYANT 6JOHN MCKAY 3NICK SABAN 3BUD WILKERSON 3DARRELL ROYAL 3BARRY SWITZER 3TOM OSBORNE 3WOODY HAYES 3