Australian Kriol is an English-based creole language that developed from a pidgin used initially in the region of Sydney and Newcastle in New South Wales, Australia, in the early days of European colonisation. Later, it was spoken by groups further west and north. The pidgin died out in most parts of the country, except in the Northern Territory, where the contact between European settlers, the Chinese and other Asians, and the Aboriginal Australians in the northern regions has maintained a vibrant use of the language, which is spoken by about 30,000 people. Despite its similarities to English in vocabulary, it has a distinct syntactic structure and grammar. It is a language in its own right and is distinct from Torres Strait Creole.

A creole language, or simply creole, is a stable natural language that develops from the process of different languages simplifying and mixing into a new form, and then that form expanding and elaborating into a full-fledged language with native speakers, all within a fairly brief period. While the concept is similar to that of a mixed or hybrid language, creoles are often characterized by a tendency to systematize their inherited grammar. Like any language, creoles are characterized by a consistent system of grammar, possess large stable vocabularies, and are acquired by children as their native language. These three features distinguish a creole language from a pidgin. Creolistics, or creology, is the study of creole languages and, as such, is a subfield of linguistics. Someone who engages in this study is called a creolist.