Charles Derek Croxton (born 1969) is an American historian. He authored several articles on military and diplomatic aspects of the Thirty Years' War. Croxton wrote Peacemaking in Early Modern Europe: Cardinal Mazarin and The Congress of Westphalia, 1643–1648. He also worked as Adjunct Professor at Madonna College and has taught at Ohio State University and at Columbus State Community College.

Alongside Anuschka Tischer, he wrote The Peace of Westphalia: A Historical Dictionary. Most recently, he was the author of Westphalia: The Last Christian Peace.

Derek is also a game designer, having designed The King's Coalition, Battalion Commander, Congress of Westphalia and Archie's War, the latter being commercially published by Worthington Publishing.