AI most frequently refers to artificial intelligence, which is intelligence demonstrated by machines.

Ai, AI or A.I. may also refer to:

• Ai (chimpanzee), an individual experimental subject in Japan
• Ai (sloth) or the pale-throated sloth, a northern Amazonian mammal species

• Ai (album), a 2004 release by Seraphim
• "A.I." (song), by OneRepublic, 2016
• A.I. Artificial Intelligence, a 2001 American film
• A.I. Rising, a 2018 Serbian film
• AI: The Somnium Files, a 2019 video game
• American Idol, a televised singing contest
• The American Interest, a bimonthly magazine (2005–2020)
• I (2015 film), an Indian Tamil film (initial title: Ai)

• A.i. (band), a Californian rock–electroclash group
• All in (poker), wagering one's entire stake
• Appreciation Index, a British measure of broadcast programme approval
• Non-player character, in gaming (colloquially, an AI)

• Ad interim (a.i.), a phrase in job titles
• Appreciative inquiry, an organizational development method
• All-inclusive, a full service at a vacation resort including meals and drinks

• Adventure International, a video game publisher
• The Art Institutes, a chain of American art schools

• Air India, the flag carrier airline of India
• Alitalia, the former flag carrier airline of Italy
• Astra International, an Indonesian automotive company

• Accuracy International, a firearms manufacturer
• Alexis I. duPont High School, Delaware, U.S.
• Amnesty International, a human rights organisation
• Appraisal Institute, an association of real estate appraisers

• Ai (surname), a Chinese surname
• Ai (given name), a given name and list of people and characters with the name
• King Ai of Zhou (died 441 BC)
• Emperor Ai of Han (27–1 BC)
• Emperor Ai of Jin (341–365)
• Emperor Ai of Tang (892–908)
• Ai (poet) (1947–2010), American poet
• Ai (singer) (born 1981), Japanese-American singer and songwriter
• Allen Iverson (born 1975), American retired professional basketball player ("A.I.")
• Andre Iguodala (born 1984), American professional basketball player ("A.I. 2.0")

• Anguilla, a Caribbean territory (by ISO 3166-1 code)
• Appenzell Innerrhoden, a Swiss canton
• Armenia (by LOC MARC code)

• Ai (Canaan), Biblical city

• Ai, Alabama
• Ai, Georgia
• Ai, North Carolina
• Ai, Ohio

• Love River (Chinese: 愛河; pinyin: Ài Hé), a Taiwanese canal
• Ai River (Gifu), Japan
• Ai River (Dandong), China

• Ái, a Norse god
• Ai (Canaan), Biblical city
• Ai (Chinese: 愛; pinyin: ài), Sinic concepts of love from Confucianism and Buddhism
• Agios, colloquially Ai, a Greek word for 'saint'
• Ai Toyon, the Yakut god of light

• Active ingredient, part of a pesticide
• Artificial insemination of livestock and pets, in animal breeding

• Airborne Internet, a proposed air-to-air data network
• Airborne Interception radar, a Royal Air Force air-to-air system
• Air interdiction, an aerial military capability
• Attitude indicator, a flight instrument on aircraft

• .ai, a top-level domain

• Accommodative insufficiency of the eye
• Amelogenesis imperfecta of teeth
• Aortic insufficiency of the heart

• Active ingredient, part of a drug
• Adequate intake, a Dietary Reference Intake nutritional parameter
• Aromatase inhibitor, a class of breast-cancer drug
• Articulation Index, a method of measuring hearing loss
• Artificial insemination, a method of fertilisation
• Automated immunoassay, automated clinical analyses of blood

• Adobe Illustrator, a vector graphics editor
  • .ai, Adobe Illustrator Artwork filename extension
• Automatic Maximum-Aperture Indexing, aperture coupling on Nikon camera lenses

• Artificial intelligence (disambiguation)
• Art Institute (disambiguation)
• All In (disambiguation)
• A1 (disambiguation)
• AL (disambiguation)
• AY (disambiguation)
• Aye (disambiguation)
• Eye (disambiguation)