Pierre Thouvenot (9 March 1757 – 21 July 1817) was a French Army officer who served with distinction in the American Revolutionary War. He fled from France during the revolution but returned under an amnesty and went on to serve in Napoleonic Wars. Thouvenot is most famous for his defence of Bayonne in 1814 and the sortie he made when the war was all but over, which drew criticism from both sides but particularly the Duke of Wellington who branded him a "blackguard".