Here's video of Arizona Diamondbacks closer Archie Bradley appearing to flip off the 'Stros after a huge home run Wednesday night ... and it's pretty hilarious!!!

In the 5th inning of the D'Backs' rout of Houston in Phoenix ... Nick Ahmed blasted a moon shot bomb deep to left-center field that had Arizona's players going crazy.

The camera panned around to everyone while Ahmed was rounding the bases -- and when it got to the Diamondbacks' bullpen, you can see Bradley clear as day pumpin' a middle finger toward the diamond.

Was it directed at the 'Stros players? Seems like it. Was it because Houston was caught in a massive sign-stealing, cheating scheme that rocked baseball? Probably.

Bradley hasn't addressed the single-barrel salute with media yet ... so it's all unclear at the moment.

What is clear, though ... is everyone still hates the Astros for their roles in a 2017 cheating scandal.

Remember, Dodgers pitcher Joe Kelly was just suspended 8 GAMES by MLB after he almost incited a brawl by nearly beaning both Alex Bregman and Carlos Correa in a game last week.