🇮🇩 Bahasa Indonesia - Official Language of Indonesia Indonesia’s official language is Bahasa Indonesia, a standardized form of Malay that serves as the national and unifying language of the country. It was formally adopted as the national language on 28 October 1928 through the Youth Pledge (Sumpah Pemuda), long before Indonesia gained independence in 1945. Bahasa Indonesia was chosen because it was already widely used as a lingua franca across the archipelago, allowing communication among hun