KLH

KLH may refer to:


 * Keyhole limpet hemocyanin, a carrier protein
 * Kolhapur Airport (IATA code KLH), a regional airport in Kolhapur, Maharashtra, India
 * Korean Light Helicopter, a designation used by the Republic of Korea Army
 * KLH (company), an audio company founded in 1957 in Cambridge, Massachusetts, United States
 * KLH-Arena, a set of ski jump hills in Murau, Austria
 * KLH Vajgar Jindřichův Hradec, an ice hockey team in Jindřichův Hradec, Czech Republic
 * WKLH (also known simply as KLH), a radio station in Milwaukee, Wisconsin, United States