Here are some of his prominent works:
* "The History of the Australian Navy" (1942): A comprehensive account of the development of the Royal Australian Navy, covering its origins, World War I and II service, and post-war evolution.
* "A History of the Australian Army" (1954): Another detailed chronicle, this time focusing on the history of the Australian Army, including its involvement in various conflicts and its transformation throughout the 20th century.
* "The Canberra Story: A History of the City" (1966): A comprehensive history of Canberra, the capital of Australia, covering its planning, construction, and development over the decades.
* "The Concise History of Australia" (1973): A shorter and more accessible account of Australian history, designed for a general audience.
* "The Royal Australian Navy: A History" (1987): A revised and updated edition of his earlier work on the Australian Navy, incorporating new research and insights.
He also authored several other books on Australian history, including biographies of prominent figures like King O'Malley and Sir William McKell.
Timperley's work is characterized by its meticulous research, detailed accounts, and insightful analyses. He is considered one of the most prominent Australian historians of the 20th century, and his works remain valuable sources of information on various aspects of Australian history and politics.