B
- Ryan Bader (KOTC, UFC)
- Siyar Bahadurzada – (Shooto, Strikeforce, World Victory Road, UFC)
- Bao Ligao – (Art of War)
- Josh Barnett – (Affliction, Pancrase, PRIDE, UFC, World Victory Road)
- David Baron – (PRIDE, Shooto, UFC)
- Phil Baroni (Cage Rage, EliteXC, PRIDE, Strikeforce, UFC)
- Pat Barry (UFC)
- Alan Belcher (UFC)
- Vitor Belfort – (Cage Rage, PRIDE, UFC)
- Robert Berry – (Cage Rage)
- David Bielkheden – (PRIDE, UFC)
- Michael Bisping – (Cage Rage, UFC)
- Tom Blackledge – (Cage Rage, UFC)
- Dan Bobish – (KOTC, PRIDE, UFC)
- Kotetsu Boku – (DREAM, Hero's, KOTC, Shooto)
- Tony Bonello – (EliteXC, KOTC, XFC)
- Stephan Bonnar – (Jungle Fight Championship, UFC)
- Kyle Bradley – (UFC)
- Ebenezer Fontes Braga – (Pancrase, PRIDE)
- Chris Brennan – (KOTC, PRIDE, UFC)
- Marcelo Brito – (WEC)
- Jonathan Brookins – (Bellator, WEC, UFC)
- Rob Broughton – (Cage Rage, UFC)
- Matt Brown (UFC)
- Mike Brown (WEC)
- Travis Browne – (Bellator, UFC)
- Junie Browning – (UFC)
- Paul Buentello – (KOTC, Strikeforce, UFC)
- Josh Burkman – (UFC)
- Mikey Burnett – (UFC)
- Murilo Bustamante – (Deep, Pancrase, Pride, UFC)
Read more about this topic: List Of Male Mixed Martial Artists