There is a HUGE celebrity charity boxing match in the works -- with some big names being thrown around ... and we've learned Floyd Mayweather is now involved.
Our sources tell us ... the combatants are big stars -- we've seen the list but we're being told there's still a matter of locking everyone up.
One of the people involved is Floyd -- but we're told he will NOT fight ... instead, our sources say he'll be one of the judges, tasked with scoring the fight.
As for the fighters themselves, we can't give it away yet -- but 2 of the names are big boxing stars and others are from the NBA, Hollywood, comedy and MMA.