A third person has been injured in the crash which happened overnight near Gleneely.
Emergency services were called to the scene at 12.45 this morning.
The single vehicle crash happened on the R-238 at Terrawee in Gleneely.
An 18 year old man and an 18 year old woman were pronounced dead at the scene.
A third person in the car at the time has been taken to hospital with injuries which aren't thought to be life-threatening.
The Gleneely to Culdaff Road is closed as garda forensic teams prepare to carry out a full investigation.
Local diversions are in place.
