David Z.T. Yui (; 25 November 1882, in Wuhan – 22 January 1936) was a Chinese Protestant Christian leader who led the Chinese National YMCA. in the 1920s and 1930s. Yui was a leader in what the historian Daniel Bays called the "Sino-Foreign Protestant Establishment", a generation of Chinese Protestant Christians who worked to make Christianity independent of foreign control and relevant to the emerging Chinese nation. Early life David Yui's father, Yu Wenqing, was an Episcopal pastor who took his family to various parts of Eastern China as he moved from pastorate to pastorate. David was schooled at home until he was thirteen. In 1895, he entered the Boone School, which was run by the American Episcopal Church Mission in Wuhan. When the school was evacuated to Shanghai in 1900 from fear of Boxer Rebellion, the students were transferred to St. John's College, where Yui's classmates included the future diplomat Wellington Koo. Yui edited the school newspaper, the St.John's Echo. Upon graduating in 1905, he returned to Wuhan to teach at the Boone school. In April 1905 he married Liu Qiongyin, a graduate of St. Hilda's School for Girls in Wuhan. Their families had arranged this marriage before the two were born, and they had known each other all of their lives. Among Yui's students was Francis C. M. Wei, who would go on to be president of the school and a national church leader. The arrest of a fellow teacher for his revolutionary activities made Yui seem suspicious to the police. At the request of the Episcopal Bishop, the American embassy in Beijing brought pressure on the local government to protect the teachers at his school, but the Bishop still felt it was prudent for Yui to leave the country. Yui enrolled at Harvard University in the fall of 1908. At Harvard Yui pursued a master's degree in education, which he took in 1910. In 1909 he was among a group of Chinese Christian students who formed the Chinese Students Christian Association in North America, and he traveled from campus to campus to organize chapters and recruit members. However, before he could carry out plans, word of his younger brother's illness called him back to Wuhan, where he became head of the Boone School. The 1911 Revolution broke out in the city of Wuhan, and Yui briefly worked for Li Yuanhong, the head of the new revolutionary government.