A farmer before entering politics, Crinion was first elected to Dáil Éireann as a Fianna Fáil TD for the Kildare constituency at the 1961 general election. He was returned for Kildare at the 1965 general election, but after boundary changes for the 1969 general election he stood in the neighbouring Meath constituency. He was defeated there, but was then nominated by the Taoiseach, Jack Lynch, to the 12th Seanad.
At the next general election, in 1973, he stood again in Meath, unseating the long-serving Fianna Fáil TD Michael Hilliard. Crinion was re-elected in Meath at the 1977 general election and again in 1981 general election, before retiring from politics at the February 1982 general election.
- "Mr. Brendan Crinion". Oireachtas Members Database. Retrieved 15 September 2012.
- "Brendan Crinion". ElectionsIreland.org. Retrieved 15 September 2012.
- The 1961 constituency boundaries had incorporated the areas of County Meath around Dunshaughlin and Trim in the Kildare constituency; but the 1969 boundary changes placed those districts in the Meath constituency, along with the Kildare districts of Edenderry and Celbridge.
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