Langlet is a surname of French or Swedish origin. People with the name include:
Abraham Langlet (1868–1936), Swedish chemist, co-discoverer of the element helium Amanda Langlet (born 1967), French actress Emil Victor Langlet (1824–1898), Swedish architect Valdemar Langlet (1872–1960), Swedish publisher and Esperantist; credited with saving many Jews from the Holocaust Yoann Langlet (born 1982), French-Mauritanian professional football player