I am assuming that by "championships in pro sports", we are referring to the NBA, NFL, NHL and MLB. Since the NFL is the youngster here all of it's teams can be eliminated immediately. In the NBA, Boston has 21 championship appearances winning 17. The Lakers have 31 championship appearances but have only won 15 of those. ( +1 to the winner of the current series). The NHL is dominated by Montreal with 34 championship appearances, winning 24 of those. But the most championship appearances by any pro sports team is 40 by the New York Yankees who have won 27 championships.
The record for the most championships in professional sports is held by the Boston Celtics, with a total of 17 NBA championships.
Bill Russell.
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professional athlete
Terry Bradshaw when he was with the Pittsburgh Steelers with 4 championships.
Michael Phelps has won 33 medals in the World Championships for his sport, Swimming.
Green bay
Michael Phelps Yogi Berra Bill Russell
the soccerroos
2.
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.
Kobe Bryant