ACH

Ach or ACH may refer to:

Places

 * A term for "river" in German hydronymy, see Aach (toponymy)
 * Ach (Ammer), a tributary of the Ammer, Bavaria, Germany
 * Ach (Blau), a tributary of the Blau, Baden-Württemberg, Germany
 * Bregenzer Ach, a tributary of Lake Constance, Austria
 * Dornbirner Ach, a tributary of Lake Constance, Austria
 * Friedberger Ach, a tributary of the Lech, Bavaria, Germany
 * Ach, Iran, a village in Qazvin Province

People

 * Ach (surname)
 * ACH (wrestler) (born 1987), American professional wrestler Albert C. Hardie, Jr.

Businesses

 * ACH Food Companies, Inc., American subsidiary of Associated British Foods
 * Aluminum Corporation of China Limited, a Chinese company
 * Automotive Components Holdings, LLC, a Ford-managed temporary company mandated to dispose of unprofitable operations of Visteon, its former parts division

Hospitals

 * Alberta Children's Hospital, Calgary, Alberta, Canada
 * Arkansas Children's Hospital, Little Rock, Arkansas, US

Medicine and science

 * Acetone cyanohydrin, a highly toxic organic compound
 * Acetylcholine (ACh), a neurotransmitter
 * Achondroplasia, a genetic disorder that is a common cause of dwarfism
 * Adrenocortical hormone, hormones produced by the adrenal cortex
 * Aluminium chlorohydrate, an aluminium inorganic polymer used as a flocculant for water purification

Organizations

 * Accion contra el Hambre, an NGO, part of the Action Against Hunger International Network
 * Association for Computers and the Humanities, international professional society for digital humanities
 * Association of Caribbean Historians

Sports

 * AC Horsens, a Danish football club
 * Allan Cup Hockey, a Canadian senior ice hockey league

Transportation

 * Achnashellach railway station, UK, National Railway code ACH
 * Adelaide-Crafers Highway
 * Angeles Crest Highway, a two-lane highway over the San Gabriel Mountains
 * St. Gallen–Altenrhein Airport, Switzerland, IATA airport code

Other uses

 * Acholi language (ach), ISO 639 code
 * Advanced Combat Helmet, worn by army soldiers
 * Air changes per hour, a unit in ventilation
 * Analysis of competing hypotheses, an investigation methodology
 * Automated clearing house, an electronic banking network used for payments and collections
 * ACH Network, the national automated clearing house for American electronic funds transfers