Donnchadh Ó Briain (17 November 1897 – 22 September 1981) was an Irish Fianna Fáil politician and Conradh na Gaeilge activist. He was elected to Dáil Éireann at the 1933 general election. He was born 17 November 1897 in Knockaderry, County Limerick, one of two sons and a daughter of David O'Brien, a creamery manager, and Kathleen O'Brien (née Casey). He was educated at Ahalin national school and then at the Redemptorist College at Mount St Alphonsus, Limerick city, but was prevented from going to university by bouts of ill health.