Rumble on the Rock is a series of mixed martial arts (MMA) events held in Hawaii by Rumble World Entertainment.
The promotion, started in 2002, is known best for featuring a lightweight superfight between top-ranked lightweights B.J. Penn and Takanori Gomi, who went on to capture titles in the Ultimate Fighting Championship and Pride Fighting Championships respectively.
Rumble World Entertainment is headed by J.D. Penn, brother of B.J. Penn.  The company joined the World Wide Cage Network of MMA promotions in October 2006.