The purpose of the present study is to examine language choice on the radio in ASEAN countries. The focus is on English and national languages, the two most important languages in those countries. A review of related past studies did not provide an answer to the question that we were interested in; i.e., which language is chosen for radio broadcasts in ASEAN countries between the national language, which is the language most people understand and signifies national identity, and English, which is the lingua franca of the region and an international language? Data was taken from a sample of programs broadcast by radio stations in the ten ASEAN countries. The results show that Singapore ranks the highest in using English in broadcasting (50% of all the programs), while Laos, Cambodia, Myanmar and Vietnam rank the lowest in using English (0%) but highest in using their national languages (100%). Code-switching between the countries’ national languages and English is found in five countries listed from highest to lowest as: the Philippines, Singapore, Brunei, Indonesia and Thailand. Code-switching is absent in Malaysia, Myanmar, Cambodia, Laos and Vietnam. We conclude that despite the importance of English in the asean community, most asean countries prefer to use their national languages in radio broadcasting.