Glenaeon Rudolf Steiner School is a private, comprehensive, co-educational, non-denominational, Steiner early learning, primary and secondary day school co-located across multiple campuses in Middle Cove, Castlecrag and Willoughby in the Lower North Shore of Sydney, New South Wales, Australia.

The three campuses include the Pre-School in Willoughby, a Junior School (K–2) at Castlecrag and years 3–12 in Middle Cove.

The school was originally established in Pymble in 1957, by Sylvia Brose OAM, out of the community surrounding Walter and Marion Burley Griffin and their belief that the values of design, the arts, community, nature and spirit needed to underpin a rich academic education.

The Middle Cove campus also includes two playing fields, two multipurpose basketball courts, specialist Design & Technology and Art facilities, a biodynamic garden and music rooms.

The high school building features several classrooms including a recently renovated library.