Castlemaine ( KASS-əl-mayn, non-locally also KAHSS-) is a town in west central Victoria, Australia, in the Goldfields region about 120 kilometres (75 miles) northwest by road from Melbourne and about 40 kilometres (25 miles) from the major provincial centre of Bendigo. It is the administrative and economic centre of the Shire of Mount Alexander. The population at the 2021 Census was 7,506. Castlemaine was named by the chief goldfield commissioner, Captain W. Wright, in honour of his Irish uncle, Viscount Castlemaine.