Tai may refer to:
- Tai peoples
- Tai languages
- Tai (surname) (邰, Tái)
- Tai (city) (also: 邰, Tái), the ancestral home of the Ji dynasty of Zhou
- Mount Tai, in Shandong, China
- Lake Tai, on the border of the Jiangsu and Zhejiang provinces, China
- Tai, a non-Chinese state near Datong in northern Shansi conquered in 457BC
- Shinto Honkyoku (Shintokyo), a Japanese religious group.
- Tai, Nigeria, a local government area in Rivers State, Nigeria
- Banu Tayy, an Arab tribe
- Tai snapper (Pagrus major), a species of reddish-brown Pacific sea bream
- Tai (comics) a Marvel Comics supervillain
- Tai Kamiya, a character from the Digimon series
- Tai, alternate name of Morgh Mohsen-e Tai, a village in Iran