Lamar Odom is going back to TV -- the former Lakers star will be joining the cast of "Celebrity Big Brother" this season ... where he'll be competing for a $250,000 cash prize.
The series announced Odom will be a guest for its third season on Thursday ... releasing a video on social media introducing all the celebs who'll be living under the same roof for the competition.
"My name is Lamar Odom [and] people may know me for winning two championships with the LA Lakers," Odom said in his intro.