Mary Utopia Rothrock (September 19, 1890 – January 30, 1976), was an American librarian and historian.

Rothrock returned to Tennessee in 1915 to serve as Head of Circulation at the Cossitt Library in Memphis.

This collection provided the core of the East Tennessee Historical Society (ETHS), of which Rothrock was a charter member.

In 1929, her article, "Carolina Traders Among the Overhill Cherokees, 1690–1760," appeared in the inaugural issue of the ETHS's annual Publications.

In 1929 she organized and co-founded with Tommie Dora Barker and Charlotte Templeton the Southeastern Library Association (SELA) in Chattanooga in 1920 and became its first President.