Ronaldo Souza, most commonly known as 'Jacare' is a Brazilian mixed martial artist and BJJ practitioner.

Souza trains at the Black House gym with the likes of Anderson Silva and Lyoto Machida.

His grappling resume is one of the most impressive in MMA, including:

2009 ADCC Superfight winner
2008 Dream Middleweight GP runner up
2004 Openweight World Jiu-Jitsu Champion
2005 Openweight World Jiu-Jitsu Champion
2005 ADCC 77-87KG Division winner
2005 ADCC Absolute Division runner-up

Souza fought in Brazil and the USA before signing for Dream and competing in the middleweight Grand Prix. He lost to eventual winner Gegard Mousasi but fought later for the title against Jason 'Mayhem' Miller in a rematch of their earlier encounter but it ended in a No Contest after an illegal soccer kick by Miller meant that he was unable to continue.

His next was a win over Matt Lindland in Strikeforce after signing for the organisation in a co-promotion with Dream.