Lucien Emile "Lou" Conein (29 November 1919 – 3 June 1998) was a French-American citizen, noted U.S. Army officer and OSS/CIA operative. Conein is best known for his instrumental role in the November 1963 coup against Ngô Đình Diệm and Diệm's assassination by serving as Ambassador Henry Cabot Lodge Jr.'s liaison officer with the coup plotters and delivering $42,000 of the known cash disbursements.