Christopher Duffy (born 1936) is a British military historian. Duffy read history at Balliol College, Oxford, where he graduated in 1961 with the DPhil. Afterwards, he taught military history at the Royal Military Academy Sandhurst and the college of the British General Staff. He was secretary-general of the British Commission for Military History and vice-president of the Military History Society of Ireland. From 1996 to 2001, he was research professor at the De Montfort University, Leicester. He currently works as a freelance author.