OPP officers responded to a single vehicle collision on the 416, near Roger Stevens Drive. The incident happened just after midnight.
Police say the car left the road and rolled over. The driver, who was alone in the vehicle at the time, was ejected.
An off-duty paramedic was first on scene and commenced first aid until Ottawa Paramedics arrived. The driver, identified as 27-year-old Mitchell Fleming, was transported to hospital and later pronounced dead.
The OPP continues to investigate the cause of the crash.