This article examines how modern Chinese Buddhism has been influenced by its interactions with the modern world. For our purposes, ‘modern Chinese Buddhism’ refers to a form of what has become known in the West as ‘Engaged Buddhism,’ but in Chinese is known by titles that can be translated as ‘Humanistic Buddhism’ or ‘Buddhism for Human Life.’ This tradition was initiated on the Chinese mainland between the two World Wars by the monk Tai Xu (1890–1947). Its main branches have flourished in Taiwan, whence two of them have spread worldwide. The most successful, at least in numerical terms, has been Fo Guang Shan (the Buddha’s Light Mountain) and Ci Ji (the Buddhist Compassion and Relief Society), the former founded by a personal disciple of Tai Xu, Xing Yun, the latter founded by Zheng Yan. Both of them are now very old but remain powerful charismatic leaders.