Leon O Broin (10 November 1902 - 26 February 1990) was an Irish Civil Servant, writer and playwright, who wrote many plays, stories and historical works in both English and Irish. He was born in Dublin. He joined Sinn Fein and Fianna Eireann while still at school. He was imprisoned in 1921 and 1922 and afterwards joined the Free State army as a non-combatant. In 1924 he was the first Administrative Officer appointed by the new Free State civil service, where he worked mainly in the Department of Finance. He was Secretary of the Department of Posts and Telegraphs from 1948 to 1967.