NFL's D'Qwell Jackson FOUND GUILTY In Pizza Boy Attack

2:20 PM PT -- Jackson's attorney, David Schertler, says he's disappointed by the verdict and still believes he did NOT commit a crime. He adds, "Keep in mind, this is a misdemeanor case for a man with an impeccable prior record."

Indianapolis Colts linebacker D'Qwell Jackson has been found guilty of attacking a pizza delivery boy during an argument over a parking space last year ... TMZ Sports has learned.

As we previously reported, Jackson -- who intercepted the pass that started Deflategate -- was arrested in Washington D.C. back in February '15 after a pizza boy told cops the Pro Bowler punched him in the face.

Officials say the pizza boy claimed the two had been arguing over a parking spot when Jackson hit him in the face and the back of the head.

Moments ago he was found guilty of simple assault -- a misdemeanor. He's facing up to 180 days in jail. He's due to be sentenced next month.