Two teens were stabbed – one repeatedly – during a brutal fight with five strangers in Queens Monday night, cops said. 

A 16-year-old boy was stabbed in the head, neck and back, while an 18-year-old boy was knifed in the face around 8:30 p.m. in front of an apartment building on 31st Avenue near 45th Street in Astoria, authorities said. 

The younger boy was taken to Harlem Hospital, and the older victim to the Elmhurst Hospital Center, where both were listed in stable condition. 

The brawl erupted when five violent suspects approached the pair, at least three of them described as males, law enforcement sources said. 

The victims did not know their attackers, though it was not immediately clear what sparked the fight, according to the sources.

No arrests had been made by Tuesday. 

The knifing came less than a week after a 15-year-old boy was stabbed on board a Bronx train when a five-person crew tried to rob him and his friend. 

He was knifed on the left side of the torso and hospitalized in stable condition, while his pal was not hurt.