The 1957 Irish general election to the 16th Dáil was held on Tuesday, 5 March, following a dissolution of the 15th Dáil on 12 February by President Seán T. O'Kelly on the request of Taoiseach John A. Costello on 4 February. It was the longest election campaign in the history of the state, spanning 30 days. The general election took place in 40 Dáil constituencies throughout Ireland for 147 seats in Dáil Éireann, the house of representatives of the Oireachtas.

The Taoiseach is the head of government or prime minister of Ireland. The office is appointed by the President of Ireland upon the nomination of Dáil Éireann and the office-holder must retain the support of a majority in the Dáil to remain in office.