Tanxu was a Chinese Buddhist monk and a 44th generation lineage holder of the Tiantai school, taught by Master Dixian. Tanxu is known as one of the most influential monks to have had lived during the late Qing and Republican periods of Chinese history, spreading and invigorating the practice of Buddhism throughout the region. He was also famous for constructing several Buddhist temples and institutes in Northern China in the early 20th century. He also achieved renown through his buildings, due to his integration of European industrial construction techniques and traditional Chinese methods.

Tiantai or T'ien-t'ai is an East Asian Buddhist school of Mahāyāna Buddhism that developed in 6th-century China. Tiantai Buddhism emphasizes the "One Vehicle" (Ekayāna) doctrine derived from the Lotus Sūtra as well as Mādhyamaka philosophy, particularly as articulated in the works of the 4th patriarch Zhiyi. Brook Ziporyn, professor of ancient and medieval Chinese religion and philosophy, states that Tiantai Buddhism is "the earliest attempt at a thoroughgoing Sinitic reworking of the Indian Buddhist tradition." According to Paul Swanson, scholar of Buddhist studies, Tiantai Buddhism grew to become "one of the most influential Buddhist traditions in China and Japan."