ACH

ACH or Ach may refer to:

Businesses

 * ACH Food Companies, Inc., American subsidiary of Associated British Foods
 * ACH Network, American electronic fund clearing house
 * Automotive Components Holdings, LLC, a Ford-managed temporary company

Hospitals

 * Adelaide Children's Hospital, former component of the Women's and Children's Hospital, Adelaide, South Australia
 * Akron Children's Hospital, Akron, Ohio, U.S.
 * Alberta Children's Hospital, Calgary, Alberta, Canada
 * Arkansas Children's Hospital, Little Rock, Arkansas, U.S.

Organizations

 * Accion contra el hambre, part of the Action Against Hunger network
 * Association for Computers and the Humanities

People

 * Ach (surname)
 * ACH (wrestler), American professional wrestler Albert C. Hardie, Jr (born 1987)
 * Ach., taxonomic author abbreviation for Erik Acharius (1757–1819), Swedish botanist

Places

 * Aach (toponymy), a term for "river" in German hydronymy
 * 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

Science

 * Acetone cyanohydrin, an organic compound
 * Acetylcholine (ACh), a neurotransmitter
 * Aluminium chlorohydrate, a group of water-soluble, specific aluminium salts

Sports

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

Transportation

 * Achnashellach railway station, Scotland, National Railway code ACH
 * St. Gallen–Altenrhein Airport, Switzerland, IATA airport code ACH

Other uses

 * Acholi dialect, ISO 639 code ach
 * Advanced Combat Helmet, in the United States Army
 * Air changes per hour, a measure of ventilation
 * Analysis of competing hypotheses, a methodology
 * Automated clearing house, a network for processing transactions