The ai is a three-toed sloth of the genus Bradypus.

In Japanese and Mandarin Chinese (and many other Chinese dialects), ai is the most common romanization of the character for love, 愛.

The name Ai may refer to:

• Ai, a chimpanzee who has participated in experiments in animal cognition at Kyoto University
• Ai, an American poet born in 1947.
• Ay (also spelled Ai), a pharaoh of Ancient Egypt.
• Ai, a place mentioned in the Bible, which is probably identical to the archaeological site of Et-Tell.
• Ái, in the story of Ríg in Norse mythology was husband of Edda and putative ancestor of the thralls or serfs.
• Aoi Mac Ollamain (often abbreviated as Ai), the Celtic god of poetry.

The abbreviation A.I., AI or sometimes Ai may stand for:

• artificial intelligence
• A.I., a 2001 film directed by Steven Spielberg.
• ad interim
• artificial insemination
• air interdiction
• Amnesty International
• Anguilla (ISO 3166-1 alpha-2 country code and Internet TLD)
• Aortic insufficiency
• Appenzell Innerrhoden, a Swiss canton
• American Idol
• Australian Idol
• The Art Institutes
• the Artificial Intelligence album series by Warp Records.
• Allen Iverson, an NBA basketball player
• the IATA code for Air India