Lannes is a surname. Notable people with the surname include:
Carlos Lannes (born 1979), Argentine cross-country skier Georges Lannes (1895–1983), French film actor Gustave Olivier Lannes de Montebello (1804–1875), French general and politician, son of Jean Lannes , French diplomat, grandson of Jean Lannes, ambassador of France to Russia (1891–1902) Henriette H. Lannes (1899–1980), central historical figure in the Gurdjieff Foundation Jean Lannes (1769–1809), duke of Montebello, Prince of Siewierz, Marshal of France Jean Lannes (mathematician) (born 1947), French mathematician Louis Napoléon Lannes (1801–1874), French diplomat and politician, son of Jean Lannes Louise Antoinette Lannes, Duchess of Montebello (1782–1856), French courtier, second wife of Jean Lannes Roberta Lannes (born 1948), American writer