Nate Diaz is now a wanted man in Louisiana ... cops said Monday afternoon they've issued an arrest warrant for the former UFC star -- after he was seen on camera choking out a man on Bourbon Street.
The incident happened late Saturday night after Diaz had attended the Misfits Boxing 6 event in New Orleans.
In footage of the altercation, you can see Diaz got a man in a headlock during what appeared to be a large dispute -- and he didn't let the guy go until he was unconscious.
The man later took to social media to say he suffered a gnarly head wound during the incident.