Francis Seymour Larpent (15 September 1776 – 21 May 1845) was a British lawyer and civil servant. From 1812 to 1814, he served as Judge-Advocate General of the British Army under Arthur Wellesley, 1st Duke of Wellington. He wrote an account of this period which provides information about the theory and practice of military justice in the early 19th century. After the Napoleonic Wars, Larpent worked in Gibraltar and Vienna, before returning to the United Kingdom where he died in 1845.