James Mathew Dillon was an Irish Fine Gael politician who served as Leader of the Opposition and Leader of Fine Gael from 1959 to 1965 and Minister for Agriculture from 1948 to 1951 and 1954 to 1957. He served as a Teachta Dála (TD) from 1932 to 1969.

Fine Gael is a liberal-conservative and Christian-democratic political party in Ireland. Fine Gael is currently the third-largest party in the Republic of Ireland in terms of members of Dáil Éireann and largest in terms of Irish members of the European Parliament. The party had a membership of 25,000 in 2021. Simon Harris succeeded Leo Varadkar as party leader on 24 March 2024.