Adrian John Liddell Hart (1922–1991) was a British soldier, Royal Navy officer, Liberal Party politician, author and adventurer.
With the outbreak of the Second World War in 1939 he joined the British Army and in 1940 became adjutant of the Local Defence Volunteers at Dartington, Devon.
After obligatory sea time as a junior rank on the Flower-class corvette Carnation during which he saw service in the Battle of the Atlantic, he was commissioned and attended the RNVR officer training course at HMS King Alfred in Hove, Sussex.
In 1962, he became an Analyst in London for Gordon Rayment and Co. Ltd., and in 1963 Assistant General Secretary of the United Nations Association International Service.
He was a public relations executive for Informat from 1965 to 1966, then in 1968 joined St John's House, London, a hostel for homeless young offenders.