The Mosman Preparatory School, officially the Mosman Church of England Preparatory School and commonly abbreviated as Mosman Prep, is a dual-campus independent Anglican single-sex primary day school for boys, located on the Lower North Shore and the Northern Beaches of Sydney, New South Wales, Australia.

The school opened its outdoor educational campus in Terry Hills.

Nowadays the school aims to provide a social and sporting as well as academic education.

Houses were introduced to the school in Mr. Begbie's time as headmaster.

The School has two campuses, the main school in the suburb of Mosman and its outdoor educational campus located in Terrey Hills, it was designed to teach students about the outdoors, to have a change in the learning environment from in a classroom to an open area and to be used as a sporting facility for weekend sport and training.