Brigadier Leonard Cuthbert Lucas, (6 November 1894 – 3 September 1978) was an Australian architect, public servant and Army officer. During the First World War he served at Gallipoli and on the Western Front. During the Second World War he served with the 6th Division in Libya, Greece and Ceylon, and was Deputy Engineer-in-Chief at Advanced Land Headquarters, South West Pacific Area. After the war he was in charge of the construction effort supporting the Operation Totem British nuclear weapons tests in Australia in 1953.