CLH

CLH may refer to:

Science

 * Chlorophyllase, an enzyme
 * Hydrogen chloride, a chemical compound

Companies

 * CLH (company), a Spanish petroleum logistics company comprising Compañía Logística de Hidrocarburos and others
 * CLH Pipeline System (CLH-PS), a UK system run by Compañía Logística de Hidrocarburos
 * Lufthansa CityLine (ICAO code), a German airline
 * Coolah Airport, IATA airport code "CLH"