Sir Jackie Stewart has won the most F1 World Championships by a British driver with 3; 1969, 1971 and 1973.He is the only British driver to win three F1 World Championships.
Jackie Stewart
Phil 'The Power' Taylor has won fourteen darts World Championships as of 2008 and over 130 pro tournaments and if you count pro wrestling 'The Nature Boy' Ric Flair has won a combined 16 championships in the NWA, WCW and WWE.
The Boston Celtics won the most NBA championships. They won 17 NBA Titles (
The Yankees have won the most championships in sports. They have won 27 World Series. The Lakers have won 16 NBA championships.
UCLA has won 11 NCAA mens championships. Tennessee has won 8 NCAA women's championships.
The Boston Celtics won the most NBA titles with 17 championships. The Lakers have the second most with 16 championships.
The UCLA Lady Bruins have won the most National Championships in Collegiate Fastpitch Softball...I believe they have won 25 or 26 National Championships.
Yogi Berra won the most championships as a New York Yankee with 10.
Yogi Berra won the most World Series championships as a player with 10.
The Boston Celtics have won the most championships. They have won 17. And the Lakers come n 2nd with 16.
Total, they have won 21 National Championships and rank anywhere from #7 to #11 in the nation for the most Championships obtained.