Baron Davis -- Planning NBA Comeback ... In Talks with 'Playoff Contender'

Baron Davis is in talks to return to the NBA ... TMZ Sports has learned ... with sources telling us the 35-year-old has been in communication with multiple "playoff contenders."

Davis -- a 2-time NBA All-Star -- hasn't played in the league since 2012 ... but we're told he's been keeping himself in shape and is serious about a return to the pros.

Our sources say Davis -- the #3 overall pick in the 1999 NBA Draft -- has been speaking with several squads who feel he could be a good backup for a young point guard.

We're told the Clippers and the Cavs are among the playoff contenders interested in Davis ... with the Lakers also in the conversation.

We're told so far ... there is NOT a deal in place, but that could change very soon.

Stay tuned ...