The Irish general election of 1918 was the part of the 1918 United Kingdom general election which took place in Ireland. It is now seen as a key moment in modern Irish history because it saw the overwhelming defeat of the moderate nationalist Irish Parliamentary Party (IPP), which had dominated the Irish political landscape since the 1880s, and a landslide victory for the radical Sinn Féin party. Sinn Féin had never stood in a general election, but had won six seats in by-elections in 1917–18. The party had vowed in its manifesto to establish an independent Irish Republic. In Ulster, however, the Unionist Party was the most successful party.