Caitlín Brugha (née Kingston; 11 December 1879 – 1 December 1959) was an Irish Sinn Féin politician.
Born Kathleen Kingston, in Birr, County Offaly, she married Irish revolutionary Cathal Brugha in 1912. Her husband died in 1922 during the Irish Civil War and she was elected to Dáil Éireann as a Sinn Féin Teachta Dála (TD) at the 1923 general election for the Waterford constituency. She was re-elected at the June 1927 general election. In accordance with Sinn Féin abstentionist policy of the time, she did not take her seat in Dáil Éireann. She did not contest the September 1927 general election.
Her son, Ruairí Brugha later became a Fianna Fáil politician and was elected to Dáil Éireann at the 1973 general election.