It is Liverpool football club with 18 league cups 5 champion league and f.A cups as well.
I think Liverpool FC
Liverppol Fc are the most successful club side in the history of the game
The most successful profession team is the Brazalian team.
Manchester United is the most successful English Football Team. They have won 62 major trophies in England alone in the history of the team.
The Arkansas Razorbacks from the University of Arkansas are the most successful Arkansas football team. Arkansas does not have a National Football team, therefore the most successful team would be a college team.
accrington stanley
Boston Celtics are the most successful NBA Team with 17 Championships, as of 2009.
The three most successful clubs in England are Manchester United, Liverpool and Arsenal.
The Yankees are the all-time most successful team with 26 world series championships.
Brazil
The two most successful sports franchise world wide are the New York Yankees of American Major League Baseball, and the Manchester United soccer club in England. Edit: Manchester United aren't even the most successful English team, that is Liverpool FC. In Europe, Real Madrid are considered the most successful with FIFA voting them the most successful club of the 20th century.
CLIPPERS