If you mean the one from 2007-present then it is gold medal by Tha Trademarc and composed by dale oliver.
Tha Trademarc John Cena's cousin
youtube
its called you suck
Tha Trademarc....... John Cena's cousin
Rev Theory sings the theme song.
John Cena actually sings his own theme song and is the first to do so
Rev Theory sings Randy Orton's theme song.
Gloria Loring sings the theme song of The Facts of Life.
in the first 2 seasons kate alexa sings the theme song. in season 3 indiana evans sings the theme song. ps i love h2o
The show's composer, Rob Cairns, sings the theme song.
Christina Milian sings the Kim Possible theme song.
Everlast sings the theme song to Saving Grace.