Taiwan or Tai Wan can refer to:

Taiwan (Formosa)

Taiwan, the country itself in geography also known as Formosa
The historical name "Taiwan Prefecture" or "Taiwan-fu" may refer to Tainan City in the 19th century
Republic of Formosa, the 1895 Taiwan Republic
Republic of China, the political entity known as Taiwan governing the island

• Taiwan Province, the administrative division of the Republic of China governing most of the island and all surrounding islets
  Taiwan Province (People's Republic of China), the administrative division claimed by the People's Republic of China (mainland China)
  Republic of Taiwan, the proposed nation-state of Taiwan