Tiantai Mountain (also Tí Taî in the local language) is a mountain in Tiantai County, Taizhou, Zhejiang Province, China. Its highest peak, Huading, reaches a height of . The mountain was made a national park on 1 August 1988. One of nine remaining wild populations of Seven-Son Flower (Heptacodium miconioides) is located on mount Tiantai.
In the mythology of Traditional Chinese religion, the creator goddess Nüwa cut the legs off a giant sea turtle () and used them to prop up the sky after Gong Gong damaged Mount Buzhou, which had previously supported the heavens. A local myth holds that Tiantai was on the turtle's back before and Nüwa relocated it to its current position when she had to remove the turtle's legs.
Guoqing Temple on the mountain is the headquarters of Tiantai Buddhism, and also a tourist destination. Tiantai, named for the mountain, is an East Asian Buddhist school of Mahāyāna Buddhism that developed in 6th-cen