The Kid Laroi‘s crew was involved in a recent brutal bar fight … and we’ve learned it was security-on-security violence.

Here’s the deal … Kid dropped by The Pint bar in Nova Scotia after performing at Magnetic World in Halifax on Sunday night … and that’s pretty much right when the mess started.

See for yourself … Kid Laroi’s security throws a wicked punch at a man who he’d been jawing with … and TMZ is told that dude was an off-duty security guard who was taking pics of KL and got his phone swiped by Kid’s manager.

It doesn’t take long for more fists to start flying — and total chaos erupts! It’s pretty savage to watch … ’cause some punches land big time as more of the crowd jumped into the mix.

It’s worth noting … it appears Kid tried to get in between the dueling security guards and attempted to break up the brawl.

Ultimately, the fight was broken up … and we’re told Kid Laroi left the bar and went to another bar down the street.

Police weren’t called … so it seems the only result is some of those involved are going to have shiners for sure.

Hey, “Nights Like This” … are we right?