The Reverend Lancelot Edward Threlkeld (20 October 1788 – 10 October 1859) was an English missionary.Threlkeld was son of Samuel Joseph Threlkeld, was born in England. He was well educated, and in 1814 the London Missionary Society accepted him as a missionary to the heathen. In the following year he was ordained as a missionary and sailed for Tahiti, but the illness and subsequent death of his child detained Threlkeld for a year at Rio de Janeiro, where he started a Protestant church.