Radio 4XO was a local radio station in Dunedin, New Zealand which began in October 1971 as one of the first privately owned commercial radio stations in the country. The callsign/station identity 4XO was assigned because 4 meant the area south of Canterbury, the X meant private (not a government station) and O stood for the province Otago. The station was originally known as "Radio Otago 4XO" and was always involved in local events and was one of Dunedin's most well-known and popular stations.