Verner Warren Clapp (June 3, 1901 – June 15, 1972) was a librarian, writer, and polymath. Starting as a summer clerk at the Library of Congress in 1922, Clapp rose to chief assistant librarian and acting Librarian of Congress. In 1956, he left the Library to serve as the first President of the Council on Library Resources. In these and other capacities, Clapp significantly contributed to administrative and technological modernization of the Library of Congress and to librarianship generally.