ACI may refer to:

Aviation

  • Aero Club of India, the apex body of all flying clubs and the governing body for air sports in India
  • Aircalin, an airline (ICAO code: ACI)
  • Air Cargo Inc., an organization that provides information to the freight forwarding industry
  • Airports Council International, international trade group of the world's commercial aviation industry, based in Montreal, Canada
  • Aviators Code Initiative, an organization advancing flight safety and professionalism
  • Aviazione Cobelligerante Italiana, the air force of the Royalist "Badoglio government" in southern Italy during the last years of World War II
  • IATA airport code for Alderney Airport in Guernsey

Businesses and organizations

In education

  • Agincourt Collegiate Institute a secondary school located in Toronto, Canada
  • Albertson College of Idaho, now known as the College of Idaho, a small liberal-arts college in Idaho
  • American Collegiate Institute, Izmir Amerikan Lisesi, located at İzmir, Turkey

In transportation

  • Alternate Concepts, a transportation management company in the United States

Other businesses and organizations

  • ACI (conglomerate), one of the largest Bangladeshi conglomerates
  • ACI Worldwide, a payments software company
  • Adriatic Croatia International Club, a chain of marinas in Croatia
  • Albertsons Companies, Inc., an American supermarket chain
  • American Concrete Institute, a non-profit standards-developing organization
  • American Constitutional Initiative, a non-profit organization that promotes progressive change
  • Anti-Coercion Instrument, EU instrument to protect the EU and its member states from economic coercion
  • Anti-Corruption Ireland, political group created by Gemma O'Doherty
  • Arch Coal inc., A major U.S. coal mining company
  • Aurora Cable Internet, a digital cable television, cable internet and VOIP provider in Aurora, Ontario
  • Automobile Club d'Italia, a member of the Fédération Internationale de l'Automobile

Places

  • Aci Castello (Sicilian: Jaci Casteddu), a city and comune in the Province of Catania in Sicily, Italy
  • Acı, Pasinler
  • Acireale, Sicilian city sometimes abbreviated Aci
  • Adult Correctional Institutions, facilities operated by the Rhode Island Department of Corrections
  • Jaci (river), also called the Aci

Science and technology

  • Adjacent-channel interference, power from a signal in an adjacent channel
  • An alternate name for the nitronate moiety
  • Application container image, a specification for the format and environment of virtualization containers, initiated by CoreOS
  • Autologous chondrocyte implantation, a medical treatment for articular cartilage damage
  • Automatic Car Identification, a railroad barcode system that preceded the automatic equipment identification
  • Cisco Application Centric Infrastructure, Cisco's implementation of software-defined networking

Other uses

  • Anti-Coercion Instrument, a regulation of the European Union aiming to protect the EU and its member states from economic coercion by third countries
  • Accusative and infinitive a.k.a. accusativus cum infinitivo, a construction in Latin grammar
  • Ace Combat Infinity
  • Acis (Italian: Aci) of Acis and Galatea in Greek mythology
  • Air Crash Investigation, an alternate name for the television series Mayday
  • Aka-Cari language, an extinct Great Andamanese language
  • American Competitiveness Initiative, a federal program intended to help America maintain competitiveness
  • Assassin's Creed I, the first entry in the long-running Assassin's Creed series.