The 2011 Irish general election took place on Friday 25 February to elect 166 Teachtaí Dála across 43 constituencies to Dáil Éireann, the lower house of Ireland's parliament, the Oireachtas. The Dáil was dissolved and the general election called by President Mary McAleese on 1 February, at the request of Taoiseach Brian Cowen. The 31st Dáil met on 9 March 2011 to nominate a Taoiseach and approve the new ministers of the 29th government of Ireland.

Dáil Éireann is the lower house, and principal chamber, of the Oireachtas, which also includes the president of Ireland and a senate called Seanad Éireann. It consists of 160 members, each known as a Teachta Dála. TDs represent 39 constituencies and are directly elected for terms not exceeding five years, on the system of proportional representation by means of the single transferable vote (PR-STV). Its powers are similar to those of lower houses under many other bicameral parliamentary systems and it is by far the dominant branch of the Oireachtas. Subject to the limits imposed by the Constitution of Ireland, it has power to pass any law it wishes, and to nominate and remove the Taoiseach. Since 1922, it has met in Leinster House in Dublin.