Nassau County police say one of the cars carrying three teenage boys broadsided the other vehicle, driven by a woman.
The accident happened at the intersection of Salisbury Road and Bowling Green Drive in Westbury just after 5:30 p.m. Tuesday.
Police say the force of the collision ejected the driver, 17-year-old Francesco Posillico, from the car and knocked down a utility pole and wires. Poscillico later died at the hospital.
The teens attended nearby W.T. Clarke High School.
One of the boys was in stable condition in the intensive care unit. The injuries of one of the other teens were immediately known.
The 24-year-old female driver of the SUV suffered minor injuries.
The crash is under investigation.