Henry Walter Barnett, usually known as H. Walter Barnett, was an Australian photographer and filmmaker. Barnett was a prominent portrait photographer of the late 19th and early 20th centuries, establishing the successful Falk studios in Sydney. Later in his career he was based in London, England, with studios at Hyde Park Corner and Knightsbridge. Barnett became involved in filmmaking after meeting cinematographer Marius Sestier in 1896, and with Sestier made some of the first films shot in Australia.