Stephen Barnes Lacy (October 24, 1908 – February 3, 2000) was an American college sports coach, educator, and political adviser. He served as the head football coach at Milligan College—now known as Milligan University—in Milligan College, Tennessee from 1933 to 1942. Lacy began his coaching and teaching career at Mary Hughes High School in Piney Flats, Tennessee, where he was athletic director, coach, teacher, and principal for two years. In 1933, he was hired as athletic director and head coach of football and baseball at his alma, mater, Milligan.