L33

L33 may refer to:
 * CITER 155mm L33 Gun, an Argentinian artillery field gun
 * General Motors L33 engine
 * HMS L33, a submarine of the Royal Navy
 * HMS Vivien (L33), a destroyer of the Royal Navy
 * Let L-33 Solo, a Czech glider
 * Mitochondrial ribosomal protein L33
 * Nissan Altima (L33), a Japanese automobile
 * Zeppelin LZ 76, an airship of the Imperial German Navy