A 15-year-old girl was stabbed during a fight with another teen in East Harlem early Monday, cops said. 

The teens – who appeared to know each other – clashed at the corner of Lexington Avenue and East 105th Street around 8 a.m., police said. 

During the fracas, one of the girls stabbed the other in the hip, cops said. 

The injured girl was taken to Harlem Hospital with non-life-threatening injuries, authorities said.

The incident comes a day after a 14-year-old girl was stabbed on a southbound train near the 191st Street station in Washington Heights in Manhattan, cops said. 

That victim – who was involved in a dispute with two other teen girls she knew – suffered a puncture wound to the chest and was taken to New York-Presbyterian Hospital in stable condition, the NYPD said.

A 13-year-old boy who was with the victim was also wounded but not stabbed, police and law enforcement sources said.

No arrests have been made in either case, police said.