ACH

ACH is a three-letter acronym that may refer to:

In American banking:

• Automated Clearing House, an electronic banking network often used for direct deposit and electronic bill payment

A business or organization:

• Aluminum Corporation of China Limited
• ACH Food Companies, Inc., American subsidiary of Associated British Foods
• Automotive Components Holdings, LLC, a Ford-managed temporary company mandated to dispose of unprofitable operations of Visteon, its former parts division
• Alberta Children's Hospital, Calgary, Alberta
• Arkansas Children's Hospital, Little Rock, Arkansas
• AC Horsens, a Danish football club
• American College of Heraldry, an American heraldic organization
• Accion contra el Hambre, an NGO, part of the Action Against Hunger International Network

In biology, chemistry, and medicine:

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

In transportation:

• Achnashellach railway station the National Railway code in the United Kingdom
• St. Gallen-Altenrhein Airport, Switzerland, IATA airport code
• Adelaide-Crafers Highway
• Angeles Crest Highway
• Anti-Condensation Heater

In linguistics:

• Acholi language (ach), ISO 639 code

In investigation:

• Analysis of Competing Hypotheses, an investigation methodology

In the United States military:

• Advanced Combat Helmet, or MICH TC-2000 Combat Helmet, worn by army soldiers

In heating, ventilation, and air conditioning:

• Air changes per hour, a unit in ventilation

Ach may refer to the rivers in Germany and Austria:

• Bregenzer Ach, a tributary of Lake Constance
• Dornbirner Ach, a tributary of Lake Constance
• Friedberger Ach, a tributary of the Lech