Doncaster ( DONK-ah-stər) is a suburb of Melbourne, Victoria, Australia, 18 km north-east of Melbourne’s Central Business District, located within the City of Manningham local government area. Doncaster recorded a population of 25,020 at the 2021 census.

In the 2016 Census, there were 20,946 people in Doncaster. 44.6% of people were born in Australia. The next most common countries of birth were China 15.8%, Malaysia 4.0%, Greece 3.4%, Hong Kong 3.0% and Italy 2.7%. 40.5% of people spoke only English at home. Other languages spoken at home included Mandarin 17.6%, Cantonese 10.1%, Greek 7.8%, Italian 3.6% and Persian 2.5%. The most common responses for religion were No Religion 33.9%, Catholic 17.6% and Eastern Orthodox 10.2%.

The major east–west road (Doncaster Road) leads from Kew to Donvale. The Eastern Freeway terminated at Doncaster Road at the western edge of the suburb from 1983 to December 1997. The section from Bulleen Road to Doncaster Road was originally built as two lanes each way. During this period Doncaster Road carried 60,000 vehicles a day as a major arterial road. Since then, the Eastern Freeway was extended along the course of the Koonung Creek to Springvale Road.