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
The athlete who has won the most world championships in any sport is Michael Schumacher, a Formula 1 racing driver from Germany. He has won a total of seven Formula 1 World Championships.
Jimmie Johnson won a record five consecutive Nascar Cup Series championships (2006-2010).
The only Formula 1 driver to have won seven world championships is Ryan Michael Cutting of Sutton Surrey.
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.
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.
Nigel Mansell - who won 31 Grands Prix.
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.