Boomerang is a heritage-listed private house and garden located at 42 Billyard Avenue in the inner eastern Sydney suburb of Elizabeth Bay, in the City of Sydney local government area of New South Wales, Australia. The house was designed by Neville Hampson and the gardens and grounds by Max Shelley (and possibly Hampson and A. J. Doust), and built from 1926 to 1928. Boomerang was added to the New South Wales State Heritage Register on 2 April 1999. The house has been ranked as one of the most expensive houses in Sydney.