Brigadier Professor Hew Francis Anthony Strachan, DL, FRSE, FRHS (born 1 September 1949 in Edinburgh, Scotland) is a Scottish military historian, well known for his work on the administration of the British Army and the history of the First World War. He is a brigadier and Member of Council of the Queen's Bodyguard for Scotland (Royal Company of Archers).

As a merchant seaman for three months in 1968, Strachan worked his passage around the world on Ben Line Steamers Ltd. In 1973, he worked as a member of a Sudan antiquities survey. He was educated at Rugby School, then Corpus Christi College, Cambridge with a B.A., 1971 and M.A. 1975. He was elected a research fellow of the college 1975, and after a one year stint as senior lecturer in war studies at the Royal Military Academy, Sandhurst in 1978/79 he returned to the college and became admissions tutor and then senior tutor. He has been a life fellow of the college since 1992.

His early work focused on the History of the British Army, and he was awarded the Templer Medal for "From Waterloo to Balaclava" and the Westminster Medal for "The Politics of the British Army". Commissioned by Oxford University Press to write a history of the First World War to replace C.R.M.F Cruttwell's one-volume A History of the Great War, 1914-1918, Strachan completed the first of three volumes, The First World War: Volume 1: To Arms in 2001 to wide acclaim and is acknowledged as one of the world's authorities on the subject. Accompanying the print publication of his one volume survey The First World War (2004) was a multi-part documentary series for television entitled The First World War, with some episodes being titled after the chapters in the written work. This set was also released on DVD by Image Entertainment.