Dallas Cowboys most valuable sports team

Everything is bigger in Texas - the Dallas Cowboys are the world's most valuable sports team, according for Forbes.

Dallas Cowboys have again been ranked the world's most valuable sports team, according to Forbes. (AAP)

NFL giants Dallas Cowboys have again been ranked as the most valuable sports team in the entire world, at a value of $US4 billion ($A5.43 billion).

Spanish soccer giants Real Madrid came second in a poll in Forbes magazine, at $US3.65 million ($A4.96 million).

Real are the most valuable soccer team for a fourth consecutive year, their value rising 12 per cent.

Barcelona were next on the list with a value of $US3.5 billion ($A4.75 billion), also up 12 per cent from last year.

Manchester United on $US3.3 billion ($A4.48 billion), and the NFL's New England Patriots on $US3.2 billion ($A4.35 billion) rounded out the top five.