The Harry and Penelope Seidler House is a heritage-listed modernist house located at 13 Kalang Avenue in the Sydney suburb of Killara in the Ku-ring-gai Council local government area of New South Wales, Australia. It was designed by architects Penelope and Harry Seidler and Harry Seidler & Associates, and built from 1966 to 1967 by Peter Cussel. It was added to the New South Wales State Heritage Register on 20 June 2008.