The 1911 Australian census was the first national population census held in Australia and was conducted by the Bureau of Census and Statistics. The day used for the census, was taken for the night between 2 and 3 April 1911. The total population of the Commonwealth of Australia was counted as 4,455,005 – an increase of 681,204 people, 18.05% over the 1901 "Federation" census.

The Census in Australia, officially the Census of Population and Housing, is the national census in Australia that occurs every five years. The census collects key demographic, social and economic data from all people in Australia on census night, including overseas visitors and residents of Australian external territories, only excluding foreign diplomats. The census is the largest and most significant statistical event in Australia and is run by the Australian Bureau of Statistics (ABS). Every person must complete the census, although some personal questions are not compulsory. The penalty for failing to complete the census after being directed to by the Australian Statistician is one federal penalty unit, or A$220. The Australian Bureau of Statistics Act 1975 and Census and Statistics Act 1905 authorise the ABS to collect, store, and share anonymised data.