James Mosley (b. 1935) is a retired librarian and historian whose work has specialised in the history of printing and letter design. The main part of Mosley's career has been 42 years as Librarian of the St. Bride Printing Library in London, where he curated and worked to expand the museum's large collection of printing and lettering materials, books and examples. This collection greatly expanded with the close of the metal type era, which saw many companies and printing shops selling off their equipment and archives. Mosley also expanded the library's collection of lettering and signs. He has also been a lecturer and professor at the University of Reading since 1964, and founded the British Printing Historical Society in that year.