Thomas G. Alexander (born 1935) is a historian and academic who was the Lemuel Hardison Redd, Jr. Professor of Western History Emeritus at Brigham Young University (BYU) in Provo, Utah. He is the former director of the Charles Redd Center for Western Studies. He was president of the Mormon History Association from 1974–1975. Brother Alexander is a past president of Phi Alpha Theta, the national history honor society.