Koh or KOH may refer to:
Chemistry
- Potassium hydroxide, formula "KOH"
- KOH test, a procedure in which potassium hydroxide is used to dissolve skin and reveal fungal cells under the microscope
People
- Koh (surname), a surname with various origins, including:
- Xǔ (surname), a Chinese surname sometimes spelled as Koh based on its pronunciation in Southern Min dialects
- Ko (Korean surname), occasionally spelled as Koh
People with the given name Koh include:
- Koh Gabriel Kameda (born 1975), German-Japanese concert violinist and violin teacher
- Koh Kojima or Kō Kojima (born 1928), Japanese manga artist
- Koh Masaki or Kō Masaki (1983–2013), Japanese gay pornographic film actor
- Koh Traoré (born 1989), Burkinabé born Ivorian football player
- Koh Yasuda (1907–1943), Japanese ophthalmologist, first director of Amami Wakoen Sanatorium, a leprosy sanatorium in Japan
Places
- ( ), a Thai word meaning 'island', found in names of islands of Thailand
- (), a Thai meaning 'island', found in names of islands of Thailand
- (), a Dari word meaning 'mountain', found in names of mountains of Afghanistan
- (), an Urdu loanword from Persian meaning 'mountain', found in names of mountains of Pakistan
Other
- Koh the Face Stealer, a character in Avatar: The Last Airbender
- King of the Hammers, an off-road race in Johnson Valley, California, United States
See also
- Koh-i-Noor, a diamond
- Kou (disambiguation) (which might be confused due to similar pronunciation)
- KKOH, a radio station in Reno, Nevada, US