A motorcyclist has died after a crash between a motorcycle and a truck near Castlepoint on Monday morning.

Police said the crash happened at 9.20am, about 5km from Castlepoint.

The man was in a critical condition when emergency services arrived, but died at the scene.

Castlepoint Rd, about 5km from the Lighthouse, is currently cordoned off and may be blocked for some time while the Serious Crash Unit investigates.

The name of the victim will not be released until all next of kin have been advised.