One man slashed another across the face on a Queens train early Sunday, cops said.

The 21-year-old victim was riding a Manhattan-bound A train, close to the Beach 60th Street station, around 1:40 a.m. when his attacker slashed him from his ear to his jaw, according to police.

He was rushed to Jamaica Hospital with non-life-threatening injuries.

Cops did not believe the men knew each other. It wasn’t immediately clear what provoked the slashing.