Bad news for Kareem Abdul-Jabbar ... the NBA legend has been ordered to pay more than $900k to a famous auction house for backing out of a deal to sell a bunch of his memorabilia ... TMZ Sports has learned.
Kareem had been at war with Julien's Auctions for years -- after a 2012 deal to sell 400 items went south. Kareem went to the auction house in 2014 and physically removed some of the items.
Julien's sued Kareem -- claiming they also made a $300k donation to his foundation as part of the deal to sell the items -- but he refused to refund the money when he backed out of the sale.