William Robert Nuttall Maloney (12 April 1854 – 29 August 1940) was an Australian doctor and politician. He was a member of parliament for over 50 years, beginning his career in the Victorian Legislative Assembly as the member for the seat of West Melbourne (1889–1903). He was elected to the federal House of Representatives at the 1904 Melbourne by-election, representing the Australian Labor Party (ALP). He held the seat until his death in 1940 at the age of 86, the sixth-longest period of service in federal parliament and the longest period of service as a backbencher.