Tyson Fury says he doesn't give a DAMN about money -- telling TMZ Sports he's not boxing for the paycheck because he's never met one single happy millionaire.
"I know a lot of millionaires and I don't know one happy one. Not one," Fury said.
"They're always unhappy because they're searching for more. Material stuff or money will never make a man happy. Man has got to find happiness deep within his soul."
So, why are we talking money with Fury?
He's fighting undefeated Otto Wallin on Saturday -- and if he wins that fight, Tyson says next up is a rematch with Deontay Wilder .