William David Leigh (1842-1917) was a Utah pioneer, farmer, and missionary for The Church of Jesus Christ of Latter-day Saints in Great Britain.

William David Leigh was born 25 August 1842 in Llanelly, Wales, to Samuel Leigh and Nancy Ann David. His parents had joined The Church of Jesus Christ of Latte-day Saints, and together they emigrated to America in 1849. His mother died near St. Joseph, Missouri, and the family live at Council Bluffs, Iowa, for three years. They came to Utah in 1852 in the William Morgan Company. Soon after arriving they were called to settle in Iron County, arriving in Cedar City in 1853.

William attended high school in St. George and later taught in the public schools in Southern Utah. He married Elizabeth Davis Wood on 9 July 1876 in Cedar City, Utah, and they had seven children together, two sons dying in early childhood.

William made a living as a farmer raising stock. In November 1888 he was called to serve as a missionary for the Church in the British Mission, spending most of his time near his birthplace in Wales.

William David Leigh died 26 August 1917, in Cedar City, Utah.