Thomas Francis O'Higgins was an Irish Fine Gael politician, barrister and judge who served as Chief Justice of Ireland and a Judge of the Supreme Court from 1974 to 1985, a Judge of the European Court of Justice from 1985 to 1991, a Judge of the High Court from 1973 to 1974, Deputy leader of Fine Gael from 1972 to 1977 and Minister for Health from 1954 to 1957. He also served as a Teachta Dála (TD) from 1948 to 1969.

The Leader of Fine Gael is the most senior politician within the Fine Gael political party in Ireland. Since 24 March 2024, the office has been held by Simon Harris following the resignation of Leo Varadkar.