Colonel Thomas Gay (22 January 1884 – 2 January 1953) was at the center of an intelligence ring working on behalf of Michael Collins during the Irish War of Independence. A commercial clerk by trade he later became an assistant and then subsequently head librarian with Dublin Corporation where he spent most of his career. An early member of the Irish Volunteers and an enthusiast for Gaelic Games he developed a network of important intelligence contacts which he put at the disposal of Michael Collins. And as such he played a critical role in the success of that network.