Philip J. Haythornthwaite FRHistS (born 1951) is an author and historical consultant specialising in military history, uniforms, and equipment. While his main area of research is the Napoleonic Wars, his list of publications covers a wider period from the English Civil War through to 1939.

Since 1973, Haythornthwaite has had over 80 books published, in addition to numerous articles and papers on military history. Much of this output through the publishers Orion Books and Osprey Publishing, is directed at the popular market.^{[citation needed]} His works The Armies of Wellington and Redcoats, The British Soldiers of the Napoleonic Wars as well as Picton’s Division at Waterloo are works of research.^{[citation needed][1][failed verification]}

Other work includes Haythornthwaite preparation of new editions of several well-known Peninsular War memoirs: Life in Napoleon’s Army: the Memoirs of Captain Elzear Blaze In the Peninsula with a French Hussar: Memoirs of the War of the French in Spain.

Haythornthwaite is a Fellow of the Royal Historical Society and a Member of the British Commission for Military History.^[2][3] In 2015 he was awarded a Certificate in Recognition of Lifetime Achievement jointly by the BCMH and the Peninsular War 200 organisation.^[4]

Orion Books

• World Uniforms + Battles 1815-50. London: Blandford Press. 1976. ISBN 0-71370-776-3.
• British Infantry of the Napoleonic Wars. London: Arms and Armour Press. 1987. ISBN 0-85368-890-7.
• The Armies of Wellington. London: Arms and Armour Press. 1994. ISBN 978-1-86019-849-6.
  The Armies of Wellington is the most comprehensive account ever published of the effect of this one man on the British Army during the Napoleonic era.
• Weapons & Equipment of the Napoleonic Wars. London: Arms and Armour Press. 1996. ISBN 1-85409-495-5.
• Napoleonic Infantry:Weapons and Warfare. London: Arms and Armour Press. 2001. ISBN 0304355097.

Osprey Publishing 35 titles between 1983 and 2016

• MAA 141 Napoleon's Line Infantry. London: Osprey Publishing. 1983. ISBN 978-0-85045-512-0.
• ELI 215 British Light Infantry & Rifle Tactics of the Napoleonic Wars. London: Osprey Publishing. 2016. ISBN 978-1-4728-1606-1.

Pen & Sword Books

• In the Words of Napoleon. London: Pen & Sword. 2002. ISBN 978-1-85367-483-9.
• Redcoats: The British Soldiers of the Napoleonic Wars. London: Pen & Sword. 2012. ISBN 978-1844159581.
  In this landmark book, Haythornthwaite traces the career of a British soldier from enlistment, through the key stages of his path through the military system, including combat, all the way to his eventual discharge.
• Picton's Division at Waterloo. London: Pen & Sword. 2016. ISBN 978-1781591024.
  He concentrates on the famous Fifth Division, commanded by Sir Thomas Picton, which was a key element in Wellington's Reserve. The experiences of this division form a microcosm of those of the entire army.

Other published works

• Uniforms of Waterloo in Color. USA: Hippocrene. 1974. ISBN 0-88254-283-4.
• Brassey's Almanac: The Peninsular War; The Complete Companion to the Iberian Campaigns, 1807–14. London: Chrysalis Books Group. 2004. ISBN 1-85753-329-1.