L39

L39 or L-39 may refer to:
 * 60S ribosomal protein L39
 * Aero L-39 Albatros, a Czechoslovak jet trainer
 * Bell L-39, an American experimental aircraft
 * HMS Rockwood (L39), a destroyer of the Royal Navy
 * HMS Shearwater (L39), a sloop of the Royal Navy
 * Lahti L-39, an anti-tank rifle
 * Mitochondrial ribosomal protein L39
 * Ramona Airport, in San Diego County, California