ACH or Ach may refer to:
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
- , 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