Avonsleigh is a town in Victoria, Australia, 47 km east of Melbourne's central business district, located within the Shire of Cardinia local government area. Avonsleigh recorded a population of 844 at the 2021 census.
The Post Office opened as Koenig's in 1902, was renamed Avonsleigh in 1911 and closed in 1985. It was named after the Avonsleigh guest house owned by J.W. Wright.