A man in his 50s has been killed after the bicycle he was riding was hit by a car on Wattle Road, Shellharbour.

The man, who has not been formally identified, was riding east when he was hit from behind by a white four-wheel drive about 7.10am, police said.

The accident occurred opposite the Shellharbour Workers Club.

One eastbound lane on Wattle Road has reopened after earlier being closed. Westbound traffic was unaffected.