Sir Alan Stewart Orr OBE PC QC (21 February 1911 – 3 April 1991) was a British barrister specialising in taxation who rose to be a High Court judge and a Lord Justice of Appeal. After 1958 he was known as Alan Orr QC, from 1965 as Mr Justice Orr, and from 1971 as Lord Justice Orr. During the Second World War, Orr served in the Royal Air Force Volunteer Reserve, became a wing commander, and was appointed an Officer of the Order of the British Empire for his wartime service.