Mortlake is a town in the Western District of Victoria, Australia on the Hamilton Highway, 50 kilometres (31 mi) north-east of Warrnambool. It is in the Shire of Moyne local government area and the federal Division of Wannon. As per the 2001 census, Mortlake had a population of 941, which rose to 996 in 2006, and to 1,073 in 2011.

The Western District comprises western regions of the Australian state of Victoria. It is said to be an ill–defined district, sometimes incorrectly referred to as an economic region,. The district is located within parts of the Barwon South West and the Grampians regions; extending from the south-west corner of the state to Ballarat in the east and as far north as Ararat. The district is bounded by the Wimmera district in the north, by the Goldfields district in the east, by Bass Strait and the Southern Ocean in the south, and by the South Australian border in the west. The district is well known for the production of wool. The most populated city in the Western District is the Ballarat region, with 96,940 inhabitants.