Sir Alistair Allan Horne CBE FRSL (born 9 November 1925) is a British journalist, biographer and historian of Europe, especially of 19th and 20th century France. He is a son of Sir Allan Horne (died 1944)[1] and Auriol (née Hay-Drummond),[2] niece of the 13th Earl of Kinnoull.

As a boy during World War II, Horne was sent to live in the United States. He attended Millbrook School, where he befriended William F. Buckley, Jr., who remained a lifelong friend. Horne served in the RAF in 1943–44 and later as an officer in the Coldstream Guards from 1944 to 1947. He graduated from Jesus College, Cambridge as a Master of Arts (MA) and in 1993 received the degree of LittD from the University of Cambridge.