The school was founded in 1919 by M. Isabel Douglas and is managed by a committee of members of the Religious Society of Friends (Quakers), parents and others interested. It is situated south of the city at 62 and 63 Grosvenor Road, between Rathmines and Rathgar in Dublin 6 and is convenient to many bus routes. Rathgar Junior School is a member of the Association of Independent Junior Schools. Pupils take part in various inter-school events such as Art, Poetry, Creative Writing and Drama Workshops, Quizzes, Table Tennis, Hockey, Swimming, Tennis, Basketball, Soccer and Choral activities, as well as the shared inter-schools service.