William Fiddian Reddaway (Middleton, Lancashire 2 August 1872 – 31 January 1949) was an academic and author in the very late 19th and early 20th centuries.Reddaway was educated at The Leys School and King's College, Cambridge.
He was a Fellow of King's from 1897; and a Tutor at Fitzwilliam House, Cambridge from 1898 to 1907.
He was also University Lecturer in History and Director of Scandinavian Studies; and Censor of Fitzwilliam House, Cambridge from 1907 to 1924.