Graythwaite is a heritage-listed former private home and former hospital and now school administration building located at 20 Edward Street, North Sydney, North Sydney Council, New South Wales, Australia. It was designed by Goold and Hilling and Edmund Blacket and built from 1858 to 1885 by Aaron Loveridge. It is also known as Graythwaite Nursing Home and Shore School. The property is owned by the Sydney Church of England Grammar School. It was added to the New South Wales State Heritage Register on 1 November 2002.