At about 1.15pm emergency services were called to the scene at Vittoria Road, near Koomoorang Road, about 25 kilometres south-east of Orange, following reports of a single-vehicle crash.

A passing motorist had found the car crashed and the male driver - and sole occupant of the vehicle - had died at the scene.

MAP: The area where the crash occurred ...

Neither the cause of the crash or the identity of the driver was known.

It was the second fatal crash on the region's roads in less than eight hours after another man died when a station wagon left the Castlereagh Highway north of Mudgee and hit a tree about 6am.

Anyone with information about either incident is urged to contact Crime Stoppers on 1800 333 000 or visit www.nsw.crimestoppers.com.au.

Information is treated in strict confidence, and the public is reminded not to report crime via NSW Police social media pages.