Australian English is a major variety of the English language spoken throughout Australia. Most of the vocabulary of Australian English is shared with British English, though there are notable differences. The vocabulary of Australia is drawn from many sources, including various dialects of British English as well as Gaelic languages, some Indigenous Australian languages, and Polynesian languages.

One of the first dictionaries of Australian slang was Karl Lentzner's Dictionary of the Slang-English of Australia and of Some Mixed Languages in 1892. The first dictionary based on historical principles that covered Australian English was E. E. Morris's Austral English: A Dictionary of Australasian Words, Phrases and Usages (1898). In 1981, the more comprehensive Macquarie Dictionary of Australian English was published. Oxford University Press published the Australian Oxford Dictionary in 1999, in concert with the Australian National University. Oxford University Press also published The Australian National Dictionary.

Broad and colourful Australian English has been popularised over the years by 'larrikin' characters created by Australian performers such as Chips Rafferty, John Meillon, Paul Hogan, Barry Humphries, Greig Pickhaver and John Doyle, Michael Caton, Steve Irwin, Jane Turner and Gina Riley. It has been claimed that, in recent times, the popularity of the Barry McKenzie character, played on screen by Barry Crocker, and in particular of the soap opera Neighbours, led to a "huge shift in the attitude towards Australian English in the UK", with such phrases as "chunder", "liquid laugh" and "technicolour yawn" all becoming well known as a result.