James Harden -- Adidas Drops the Hammer ... NO MORE AIR JORDANS!! (PHOTO)

James Harden went and bit the hand that's feeding him $200 million -- and now Adidas is pissed.

TMZ Sports broke the story ... Harden was spotted wearing Nike Air Jordans as he left a movie theater with GF Khloe Kardashian -- even though he just signed that sweet deal to endorse Adidas.

Make no mistake ... Adidas expects a change. The company's North American pres told ESPN, Harden wearing their brand off the court as well is "part of the deal."

The Beard's deal kicks in on Oct. 1 ... so he's got 15 more days to enjoy his Jordans. After that, he better hide those suckers away for 13 years.