Lucien Lux (born 13 September 1956 in Troisvierges) is a politician and trade unionist from Luxembourg. A member of the Luxembourg Socialist Workers' Party, Lux was in the government from 2004 until 2009, under Jean-Claude Juncker. He worked for Chemins de Fer Luxembourgeois, and in 1978 joined the Confederation of Independent Trade Unions (OGB-L) as union secretary. Lux was the chairman of the Bettembourg branch of the Luxembourg Socialist Workers' Party (LSAP) from 1986, and he became mayor of Bettembourg on 1 January 1988, which he would hold until his appointment to the government.