Mount Union shares the Innovative Interfaces catalog system with 23 OPAL libraries as well as 74 OhioLINK libraries throughout Ohio. The estate of Louis H. Brush provides annual grants to purchase books and periodicals in memory of James Alpheus Brush, the first Librarian of the University, and his wife. In 1971, the Thomas S. Brush Foundation, Inc. made a gift of approximately $500,000 to the University Endowment Fund to be used for purchase of books and periodicals in memory of Mr. Brush’s grandparents, Mr. and Mrs. Louis H. Brush.

The Sturgeon Music Library, given in memory of Bertha Fogg Sturgeon and her parents by Samuel Sturgeon, is located in Cope Music Hall next to the Department of Music office. The collection of reference books, scores, and recordings was begun by a generous donation by Mrs. Ella Wilcox Presley and the Carnegie Foundation. Presently, there are over 9,000 recordings in CD and electronic resource formats, over 7,000 music scores, a music reference collection, and approximately 15 current music periodicals in the library. Nearly 4,000 books and bound periodicals and microfilm about music are housed at the Main library.The Sturgeon Music Library includes four computer stations with CD and DVD playing capability as well as access to the campus network and library system. There is an AV room with stereo equipment, a television, DVD and VCR players, and a study area.