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.

Liam Cosgrave was an Irish Fine Gael politician who served as Taoiseach from 1973 to 1977, Leader of Fine Gael from 1965 to 1977, Leader of the Opposition from 1965 to 1973, Minister for External Affairs from 1954 to 1957, and Parliamentary Secretary to the Minister for Industry and Commerce and Government Chief Whip from 1948 to 1951. He served as a Teachta Dála (TD) from 1943 to 1981.