Ouch may refer to:

• An interjection that denotes pain
• (Obsolete jewellery term): a socket that a precious stone fits in
• Organization for Understanding Cluster Headaches, or OUCH
• Ouch, a 2008 single by London hip-hop group N-Dubz that appears on their 2008 album Uncle B
• Ouch!, a fictional album by The Rutles
• Ouch! bubble gum, a brand of gum from Hubba Bubba
• Ouches is a commune in the Loire department in central France

The Organization for Understanding Cluster Headaches (O.U.C.H.) was a 501(c)(3) non-profit organization that assists cluster headache sufferers and their families by providing information and emotional support. O.U.C.H. also supports and participates in research and communicates with the medical and pharmaceutical communities with the goal of improving diagnosis and treatment of cluster headaches.

Ouch! is the fourth studio album by Lake, released in 1980 in Germany and 1981 in the USA. It is the first album to be released following the departure of three members of the band from their peak period, Detlef Petersen, Geoffrey Peacey, and Martin Tiefense, who were replaced by Frank Hieber, Achim Opperman, and Heiko Efferz.