Ernest Thomas "Bob" Lilley M.M., B.E.M. (10 February 1914 – 14 August 1981) was a British Army soldier. A founding member of the British Special Air Service Regiment, he formerly served with the Coldstream Guards. Lilley was one of the first four men selected by Colonel David Stirling to comprise L Detachment 1st S.A.S. in Middle East Headquarters at Cairo in 1940. He took part in many operations behind enemy lines in Libya against Italian and German forces during World War II.