L31

L31 may refer to:
 * L31 ribosomal protein leader
 * 60S ribosomal protein L31
 * HMS Chiddingfold (L31), a destroyer of the Royal Navy
 * Nissan Altima (L31), a Japanese automobile
 * SPANISH LANDING SHIP Galicia
 * St. Tammany Regional Airport, in St. Tammany Parish, Louisiana
 * Zeppelin LZ 72, an airship of the Imperial German Navy