A dispute on a Brooklyn train turned violent when one man stabbed another Saturday afternoon, cops said.

The 19-year-old victim was on a Jamaica-bound J train around 3:10 p.m. when he argued with another man who suddenly stabbed him in the stomach, according to police.

The victim managed to stagger off the train at the Chauncey Street station, and paramedics rushed him to Brookdale Hospital with non-life-threatening injuries.

The suspect is in his 30s and about 6 feet tall with a dark complexion and a medium build, cops said. He was last seen wearing beige boots, blue jeans and a black and gray jacket.

Police did not know what the argument was about.