Police from a clergy abuse strike force in New South Wales have made another arrest, charging an 83-year old Catholic priest with child sex offences.

Officers say the priest sexually abused two teenage boys at a Newcastle school more than 50 years ago.

The priest was arrested at Penrith in Sydney's west and charged with eight counts of indecent assault with a child under 16 years.

Police from Strike Force Georgiana, based south of Newcastle, had been investigating the man for some time.

The alleged offences happened at a school in the Newcastle suburb of Hamilton in the 1960s.

The man, from Glenbrook in the Blue Mountains, is due to face Newcastle Local Court next month.