KH, kh, Kh or kH may refer to:
Organizations Kata'ib Hezbollah, part of the armed forces of Iraq The King's Hospital, a school in Ireland Kowloon Hospital, a hospital in Kowloon City, Hong Kong
People Kamal Haasan, Indian actor and filmmaker, sometimes abbreviated as KH in film titles (cf. KH 233) Kalevi Heikkinen (1911–1940), Finnish war correspondent whose pen name was KH
Places Cambodia (Kampuchea, Kambuja, Srok Khmer), a sovereign state with ISO 3166-2 alpha code KH .kh, the Internet country code top-level domain for Cambodia Kutná Hora District, Czech Republic (vehicle plate code) Kyustendil, Bulgaria (vehicle plate code) Bad Kreuznach, Germany (vehicle plate code) Borehamwood, Great Britain (vehicle plate code) Central Kalimantan, Indonesia (vehicle registration prefix KH) Evrytania, Greece (vehicle plate code)
Science and technology Chemistry and physics KH (hardness), a measure of the hardness of water (calcium carbonate concentration) Henry's law, constant (KH), in thermodynamics Kelvin–Helmholtz instability, a phenomenon of fluid mechanics Potassium hydride, chemical formula KH
Other uses in science and technology Kh factor, a constant used in electrical metering Key Hole, a series of imaging satellites used by various US agencies Khornerstone, a computer benchmark used in periodicals such as UNIX Review Kurepa hypothesis, in mathematical set theory Missiles etc. with prefix Kh-, indicating experimental; see List of NATO reporting names for air-to-surface missiles
Other uses Kh (digraph), in English transliteration, usually representing , but sometimes Kh (tramcar), the class of double axled high-floor tramcars A knight of the Royal Guelphic Order