Langton's Classification of Australian Wine is a listing of fine Australian wines compiled by wine-specialist auction house and online merchant Langton's. The Classification is a ranking of the best-performing Australian wines based on secondary market support over a minimum of 10 vintages. It was first published in 1991. The Classification is divided into three categories - Exceptional, Outstanding and Excellent - and new editions have appeared at intervals of approximately five years. The seventh edition was published in August 2018 and includes 136 of Australia's finest wines. Editions of the classification are identified by Roman numerals.