The 1910 World Missionary Conference, or the Edinburgh Missionary Conference, was held on 14 to 23 June 1910. Some have seen it as both the culmination of nineteenth-century Protestant Christian missions and the formal beginning of the modern Protestant Christian ecumenical movement, after a sequence of interdenominational meetings that can be traced back as far as 1854.

Joseph Houldsworth Oldham CBE (1874–1969), known as J. H. or Joe, was a Scottish missionary in India, who became a significant figure in Christian ecumenism, though never ordained in the United Free Church as he had wished.