A scuba diver has died after being pulled from the water on Sydney's northern beaches.

Police and paramedics were called to Shelly Beach in Manly just after 5pm on Thursday to reports that a man was in trouble in the water.

The 62-year-old was taken to Manly Hospital, where he died on Thursday night. It is believed he was diving alone at the popular dive spot.

A NSW Ambulance spokesperson said paramedics were called about 5.05pm.