Kevin Spacey cost the creative forces behind Netflix's hit 'House of Cards' a crap ton of money due to his alleged sexual misconduct -- and now, the guy's been ordered to pony up millions over it.

The disgraced actor lost an arbitration case he's been involved in for the past few years now with a couple of companies called MRC II and Knight Takes King Productions -- a distribution company and production company, respectively.

The two companies claimed they were doing the heavy lifting on 'HOC,' especially for the 6th season they were producing for the streaming giant ... with Kevin, obviously, being a huge part of it.

An arbitrator ruled last year that Spacey's alleged behavior did, in fact, cause MRC and Knight substantial harm by essentially torpedoing the final season ... but KS had appealed that decision, only to lose again earlier this month.

Now, the companies are asking the court to confirm the arbitration award ... which would leave Spacey and his loan-out and producing companies on the hook for about $31 million. The lion's share of the award is for compensatory damages -- more than $29.5 mil -- and the remaining million and change cover attorneys' fees and costs.

MRC and KTKP argued that there was an internal investigation of Spacey's behavior -- which included claims he'd sexually harassed/assaulted production members working on 'House of Cards' -- and after doing a deep dive, they say they found many of those accusations to be true and terminated his contract. They say his conduct caused them to suffer substantial losses ... which led to the litigation.

Spacey has avoided criminal liability thus far ... but on the civil side of things, this is a big ding. He's remained mostly low-key since the allegations surfaced -- although, he is getting back to work slowly but surely.