One person was shot and three others slashed or stabbed in overnight Big Apple violence, police said.

A 16-year-old boy walked into Harlem Hospital with a gunshot wound after being struck in the left arm at 145th Street and Lenox Avenue at around 9:20 p.m. Friday, cops said.

The victim gave no description of the gunman. There have been no arrests.

In a matter of hours, three others were slashed or stabbed on Saturday, police said.

A man riding the “1” train was slashed in his left cheek at the Christopher Street/Sheridan Square subway station in the West Village around 5:30 a.m., cops said.

The victim, 40, was in stable condition at Bellevue Hospital. The unidentified suspect ran off, police said.

At 4 a.m., a 28-year-old man was stabbed in the back and a 32-year-old man was stabbed in both shoulders on Wyckoff Avenue, near Palmetto Street in Queens.

Both victims were taken to Elmhurst Hospital with non-life-threatening injuries, the NYPD said. There have been no arrests.