taoiseach, head of government of Ireland. The office of taoiseach (prime minister) was created by the Irish constitution of December 29, 1937. Executive power in the Irish government is vested in the taoiseach, who heads the cabinet and presides over its meetings. The taoiseach must be a member of the Dáil Éireann (House of Representatives), the lower house of the Oireachtas (Parliament).
| name | term | party |
|---|---|---|
| Eamon de Valera | 1937–48 | Fianna Fáil |
| John Costello | 1948–51 | Fine Gael |
| Eamon de Valera | 1951–54 | Fianna Fáil |
| John Costello | 1954–57 | Fine Gael |
| Eamon de Valera | 1957–59 | Fianna Fáil |
| Seán F. Lemass | 1959–66 | Fianna Fáil |
| Jack Lynch | 1966–73 | Fianna Fáil |
| Liam Cosgrave | 1973–77 | Fine Gael |
| Jack Lynch | 1977–79 | Fianna Fáil |
| Charles Haughey | 1979–81 | Fianna Fáil |
| Garret FitzGerald | 1981–82 | Fine Gael |
| Charles Haughey | 1982 | Fianna Fáil |
| Garret FitzGerald | 1982–87 | Fine Gael |
| Charles Haughey | 1987–92 | Fianna Fáil |
| Albert Reynolds | 1992–94 | Fianna Fáil |
| John Bruton | 1994–97 | Fine Gael |
| Bertie Ahern | 1997–2008 | Fianna Fáil |
| Brian Cowen | 2008–11 | Fianna Fáil |
| Enda Kenny | 2011–17 | Fine Gael |
| Leo Varadkar | 2017–20 | Fine Gael |
| Micheál Martin | 2020–22 | Fianna Fáil |
| Leo Varadkar | 2022–24 | Fine Gael |
| Simon Harris | 2024– | Fine Gael |