The accident occurred around 11.25 am on Monday when a blue-coloured Mazda car left the road and collided with a tree on the A714 road north of Penninghame, resulting in the death of the female driver.
Police have now confirmed that the driver was 73-year-old Annette Glover from Grentrool Village, Newton Stewart.
Investigations into the cause of the accident are continuing.
Sergeant Wayne Carnochan said: “We want to hear from anyone who may have witnessed this crash or who was on the A714 road north of Newton Stewart on Monday morning.
“Callers can contact Police Scotland on the 101 number quoting reference PDG 0021360118.”