Bernhard Erasmus von Deroy (11 December 1743 – 23 August 1812) from the Electorate of the Palatinate became a noted general officer in the army of Bavaria. His military career began shortly after the start of the Seven Years' War. During the French Revolutionary Wars he first served on the side of the Coalition against the French revolutionaries, then fought as an ally of the First French Empire during the Napoleonic Wars. Deroy and his colleague, Karl Philipp von Wrede, were dominant personalities in the Bavarian military during the era of Napoleon Bonaparte.