Clayton is a suburb in Melbourne, Victoria, Australia, 19 km south-east of Melbourne’s Central Business District, located within the City of Monash local government area. Clayton recorded a population of 18,988 at the 2021 census.

In the 2021 census, there were 18,988 people in Clayton, down from 19,358 in 2016. The population is younger and more male-skewed than the average for the state; the median age is 28 compared to 38 for Victoria, while men and women make up 53.7% and 46.3% of the population respectively, compared to 49.2% and 50.8% for Victoria. The age curve is skewed, with 20-24 year olds and 25-29 year olds each making up approximately one-fifth of the population; for the state as a whole, 6.3% and 7.3% of the population are aged 20-24 and 25-29 respectively.