ACU may refer to:
Computing
- Address computation unit, another name for address generation unit
- Automatic Client Upgrade, a facility within the Novell Open Enterprise Server
Education
- Abilene Christian University, a private Christian university located in Abilene, Texas
- Adichunchanagiri University, a private university located in Karnataka, India
- Ahram Canadian University, a private Egyptian university located in 6th of October City, Giza, Egypt
- Ajayi Crowther University, a private Christian university located in Oyo, Oyo State Nigeria
- American City University in California or Wyoming
- Arizona Christian University, a private Christian university located in Phoenix, Arizona
- Association of Commonwealth Universities, an association that represents over 480 universities from Commonwealth countries
- Australian Catholic University, Australia's only public Catholic university
Organizations
- Acu Publishing, an imprint of the German group VDM Publishing devoted to the reproduction of Misplaced Pages content
- Altura Credit Union, a credit union in California
- American Conservative Union, a political lobbying group in the US
- Arab Customs Union, an organization under the Arab League for a Customs Union between Arab Members of the League
- Asian Clearing Union, an organization that settles international payments between member countries
- Assiniboine Credit Union, a credit union in Manitoba
- Auto-Cycle Union, the governing body of motorcycle sport in Great Britain
Military
- Assault Craft Unit, military units of the US Navy that specialize in amphibious warfare
- Army Combat Uniform, the combat uniform worn by the US Army, US Air Force, and US Space Force
Transportation
- Achutupo Airport, Achutupo, Panama (IATA code ACU)
- Auto-Cycle Union, an officially recognised motorcycle governing body of the UK
- Automovil Club del Uruguay, a member of the Fédération Internationale de l'Automobile
Geography
- Açu, municipality in the state of Rio Grande do Norte, Brazil
- Açu River, another name for the Piranhas River in Brazil
- Pariquera-Açu, a municipality in the state of São Paulo in Brazil
- Superporto do Açu, an industrial port complex in the state of Rio de Janeiro in Brazil
Other uses
- ACU (Utrecht), a music venue in Utrecht, the Netherlands
- ACU, a codon for the amino acid threonine
- Armored Command Unit, the key unit in the RTS video game Supreme Commander
- Asian Currency Unit, a proposed unit of currency for Asia and Oceania
- Assassin's Creed Unity, a game set during the French Revolution
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