Thomas Edgar "Ed" Lyon (9 August 1903 – 20 September 1978) was a prominent Latter-day Saint historian and educator.
He studied for two years at the University of Utah and then left on a mission for The Church of Jesus Christ of Latter-day Saints to the Netherlands.
After receiving his bachelor's degree from the University of Utah, Lyon taught high school for a year in Rigby, Idaho.
In 1930, Lyon began work on a master's degree at the University of Chicago which he completed in 1932, writing his thesis on Orson Pratt.
After his term as mission president, Lyon became a member of the faculty of the Salt Lake LDS Institute of Religion which largely consisted of students at the University of Utah.