Marshall Buchanan Lang TD (1868 – 3 October 1954) was a Church of Scotland minister and author. He was born into an ecclesiastical family in 1868. John Marshall Lang, his father, was Moderator of the General Assembly of the Church of Scotland in 1893 and two of his brothers were bishops: Cosmo was Archbishop of Canterbury from 1928 to 1942 and Norman was Bishop suffragan of Leicester.