Algernon Bertram Freeman-Mitford (1837 - 1916) of Batsford Park, Gloucestershire, and Birdhope Craig, Northumberland, was an English diplomat, collector and writer.
Mitford was educated at Eton College and then at Christ Church, Oxford. He entered the foreign office in 1858, and was appointed third secretary of Embassy in St Petersburg. After service in the Diplomatic Corps in Peking, Mitford went to Japan as second secretary to the British Legation. There he met Ernest Satow and wrote Tales of Old Japan (1871). He resigned in 1873.
From 1874-86 he acted as secretary to H. M. Office of Works and in 1882 he was elected Companion of Bath. From 1887 he was a member of the Royal Commission on Civil Services. From 1892 to 1895 he was member of parliament for the Stratford-on-Avon division of Warwickshire, and he was created Baron Redesdale in 1902.
He was a great-grandson of William Mitford. The Mitford sisters were his grandchildren: see Mitford family.