Mandarin is a group of Sinitic languages spoken across most of northern and southwestern China. Taiwanese Mandarin Mandarin is commonly known and officially referred to as the national language (國語; Guóyǔ) in Taiwan. Taiwanese Hokkien also known as Taiwanese Minnan, Holo, Taiwanese, or Taigi, is a variety. Mandarin Chinese is the most widely spoken language in Taiwan today. You should ask, What languages are spoken in Taiwan? The official language is Mandarin Chinese. Officially the largest and most commonly understood language of Taiwan is Mandarin Chinese.