A 14-year-old boy was stabbed Monday outside a Staten Island high school during a brawl that erupted as school let out, authorities say.

The young teen was stabbed in the torso just before 3 p.m. outside IS 49 Berta A. Dreyfus and ran back inside for help, according to police and sources.

EMS took the boy to Richmond University Medical Center, where he was expected to recover.

Cops were still investigating the incident Monday afternoon.