The Tánaiste is the second-ranking member of the government of Ireland and the holder of its second-most senior office. The Tánaiste is the equivalent of the deputy prime minister in other parliamenta

There were two governments in the 18th Dáil, which was elected at the 1965 general election held on 7 April 1965. Both were single-party Fianna Fáil governments, which had been in government since the