No, Taiwan does not officially use Cantonese as its primary language. The official language of Taiwan is Mandarin Chinese, which is used in government, education, and media. Most people in Taiwan speak Mandarin, but a significant portion of the population, especially among the older generation, also speaks Hokkien (Taiwanese) and Hakka.
Cantonese is spoken by some communities, particularly among those with roots in Hong Kong or southern China, but it is not widely used or recognized officially in Taiwan. Instead, the linguistic landscape of Taiwan is diverse, reflecting its cultural heritage, but Mandarin remains the dominant language for official purposes.