Sir Thomas O'Brien[1] (17 August 1900 – 5 May 1970) was a British trade unionist and Labour Party politician. He was also a Member of Parliament (MP) from 1945 to 1959.
O'Brien worked as a stage electrician. In 1932 he replaced Hugh Roberts as General Secretary of the National Association of Theatrical and Kine Employees.[2] He held the post until his death, and was a member of the TUC's International Committee.[3] He was elected at the 1945 general election as the MP for Nottingham West, and after that constituency's abolition in boundary changes, he was re-elected at the 1950 general election for the new Nottingham North West seat. That constituency was in turn abolished for the 1955 general election, and that is when he was returned to the House of Commons for the re-established Nottingham West seat.