The 20-year-old's body was discovered in a Peugeot 106 in Yateley, Hampshire, at 08:00 GMT.
Police said it was thought the car had been involved in a "traffic incident" at about 02:00 in Cricket Hill Lane, at the junction with Carrick Road.
The car was found in undergrowth nearby. Officers said someone had reported hearing a bang.
Hampshire Constabulary said the man's next of kin had been informed but formal identification was yet to take place.
Anyone with information is urged to contact the force.
A man has been found dead in a car police believe may have been involved in a crash six hours earlier.