A man has died after a crash between a motorbike and car at Spencer, on the Hawkesbury River.
About 11.30am Police responded to reports o a collision on a stretch of Wisemans Ferry Road between Berecry Road and Mangrove Creek Road.
A 53-year-old motorcyclist from Wallsend died at the scene.
A 44-year-old man driving a car was treated at the scene for minor injuries, and has been sent for mandatory testing.
Traffic diversions have been put in place, and Police are monitoring the scene.
Officers from Brisbane Water Police District have established a crime scene and commenced inquiries into the circumstances surrounding the incident.