{{wiktionary|ACH|ach|aćh|ách|-ach}} '''ACH''' or '''Ach''' may refer to: {{tocright}}

==Businesses and organisations== ===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, South Australia * Akron Children's Hospital, Ohio, U.S. * Alberta Children's Hospital, Canada * Arkansas Children's Hospital, U.S.

===Organizations=== * {{lang|es|Acción contra el hambre}}, part of the Action Against Hunger network * Association for Computers and the Humanities

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

==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 * 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 * Air changes per hour, a measure of ventilation

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

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

==Other uses== * Acholi dialect, ISO 639 code ach * Advanced Combat Helmet, in the United States Army * Analysis of competing hypotheses, a cognitive methodology * Automated clearing house, a network for processing financial transactions * Aboriginal Cultural Heritage Act 2021, or ACH Act, in Western Australia

==See also== * List of rivers in Germany * List of rivers in Austria

{{disambiguation|geo}}