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
See also KHL