Guy Anthony Marco (October 4, 1927, New York — April 5, 2022, Chicago) was an American musicologist, librarian, and academic.
He then joined the faculty of Chicago City Junior College where he taught both music and humanitied in addition to working as a librarian.
He remained in that post for the next seventeen years during which time he developed training specific to music librarians.
From 1985 to 1989 he worked for the United States Army as chief of library activities at Fort Dix in New Jersey.
[1] As an academic, Marco published journal articles and reviews on 17th- and 18th-century music and on opera and on topics related to library science.