English abbreviations from abts to ac
- ABTS (American Board of Thoracic Surgery)
- ABU (Airman Battle Uniform)
- ABU EN (Asociacion de Bibliotecas Universitarias y Especializados de Nicaragua)
- A-BUG (AdSonar - Bulk Upload Gateway)
- ABUG (AdSonar Bulk Upload Gateway)
- ABUI (Association of Banyan Users International)
- ABUP (Auxiliary Back- Up Plate)
- ABUS (Accepted, But Uninstalled System)
- ABUSCO (Abuakwa State College)
- ABV (Alcohol by volume)
- ABVE (American Board of Vocational Experts)
- ABVP (Akhil Bharat Vidyarthi Parishad)
- ABVT (Ananda Buddha Vihara Trust)
- ABW (Aruba (ISO 3166 trigram))
- ABWF (A Better Way Foundation)
- ABWT (Ansar Burney Welfare Trust (Pakistan))
- ABX (Albury Airport)
- ABY (Southwest Georgia Regional Airport)
- ABYC (American Boat and Yacht Council)
- ABZ (Aberdeen Airport)
- AC (alternating current)
- A.C. (Auditor Camerae (Auditor of the Papal Treasury))