Fianna Fáil (
fē'ənə fäl) , Irish political party, organized in 1926 by opponents of the Anglo-Irish treaty of 1921 establishing the Irish Free State and setting up Northern Ireland as part of the United Kingdom. Led by Eamon
De Valera, the party gained control of the government in 1932 and pursued a policy of complete political separation from Great Britain. Except for the years 1948–51 and 1954–57, it held power continuously until 1973, when it lost to an alliance of the
Fine Gael and Labour parties. Fianna Fáil held power again under Jack
Lynch (1977–79) and Charles
Haughey (1979–81), but lost once more to the Fine Gael. After a brief return to power under Haughey in 1982, it remained in opposition until 1987, when it once again formed a government under Haughey (after 1989 in coalition with the Progressive Democrats). When scandal forced his resignation in 1992, Albert
Reynolds succeeded him, heading a Fianna Fáil–Labour coalition. Reynolds resigned in 1994, and a Fine Gael–Labour coalition came to power. The party returned to power in 1997 under Bertie
Ahern, in coalition with the Progressive Democrats and, from 2007, with the Greens. When Ahern resigned in 2008, Brian Cowen was chosen to succeed him as party leader and prime minister.