Mary Utopia Rothrock (September 19, 1890 – January 30, 1976), was an American librarian and historian. Born in Brick Church in Giles County, Tennessee, Rothrock grew up Trenton, Tennessee. She was the youngest of five children of John Rothrock, a Presbyterian minister, and his wife, Utopia (Herron) Rothrock. She attended public schools in Milan, Tennessee, and Somerville, Tennessee, and the Ward Seminary in Nashville. She graduated from Vanderbilt University in 1912 with a Master of Science degree, and the New York School of Library Science in Albany in 1914. While in New York, she worked as an assistant at the New York State Library. Rothrock returned to Tennessee in 1915 to serve as Head of Circulation at the Cossitt Library in Memphis.