ACI

ACI may refer to:

Arts and media

Ace Combat Infinity, a combat flight simulation video game
Air Crash Investigation, an alternate name for the television series Mayday
Assassin's Creed (video game), the first entry in the long-running Assassin's Creed series

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
Alderney Airport in Guernsey (IATA airport code ACI)

Agincourt Collegiate Institute, a secondary school 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

ACI (conglomerate), a Bangladeshi conglomerate
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-Corruption Ireland, a political group created by Gemma O'Doherty
Arch Coal Inc., a 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
Allied Communications Inc., a defunct television syndicator

Accusative and infinitive a.k.a. accusativus cum infinitivo, a construction in Latin grammar
Aka-Cari language, an extinct Great Andamanese language

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
Alderney Airport in Guernsey (IATA airport code ACI)
Jaci (river), also called the Aci

Adjacent-channel interference, power from a signal in an adjacent channel
The nitronate moiety, alternately called ACI)
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

Anti-Coercion Instrument, a regulation of the European Union aiming to protect the EU and its member states from economic coercion by third countries
Acis (Italian: Aci) of Acis and Galatea, in Greek mythology
American Competitiveness Initiative, a federal program intended to help America maintain competitiveness