Conor McGregor is finally apologizing for sucker punching a man in the head at a pub in Ireland ... saying "I was in the wrong."
The UFC superstar is speaking out 1 week after TMZ Sports posted video of the incident ... telling ESPN's Ariel Helwani that there was no excuse for his behavior.
"I mean, in reality, it doesn't matter what happened there. I was in the wrong. That man deserved to enjoy his time in the pub without having it to end the way it did."
McGregor says that he made amends with the man shortly after the April bar attack -- which happened to be a dispute over his Proper 12 whiskey.