Thomas Dewar Weldon (5 December 1896, 3 Bryanston Mansions, York Street, Marylebone, London - 13 May 1958, Oxford), known as Harry, was a British philosopher.
After an education at Tonbridge School, he won a scholarship to read literae humaniores at Magdalen College, Oxford, though his assumption of it was postponed when he was made an officer in the Royal Field Artillery in 1915. He spent World War I in France, rising to acting captain, being wounded and winning the Military Cross and bar). He finally went up to Oxford in 1919, graduating with a first class degree in 1921 and being eleceted a fellow at philosophy tutor at his college two years later, getting to know CS Lewis (though Lewis described Weldon as quick to anger and cynical). He then served as Rhodes travelling fellow in 1930, a civil servant in London from 1939 to 1942, and PA to Arthur Harris in RAF Bomber Command at High Wycombe from 1942 to 1945. In the final of these three roles he justified Harris's bombing strategy to politicians and the public. His death in 1958 was attributed by college rumour to suicide but was in fact due to a cerebral haemorrhage.