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

• Ai (surname) (艾), a Chinese surname
• Ai (given name), various people with the given name Ai
• Ai (poet) (1947–2010), American poet
• Ai (singer) (born 1981)
• Ai as a colloquial form of Hagios, a Greek word for "Saint"

.ai is the Internet country code top-level domain (ccTLD) for Anguilla. It is administered by the government of Anguilla.

Artificial intelligence (AI) is the intelligence exhibited by machines or software. It is also the name of the academic field of study which studies how to create computers and computer software that are capable of intelligent behavior. Major AI researchers and textbooks define this field as "the study and design of intelligent agents", in which an intelligent agent is a system that perceives its environment and takes actions that maximize its chances of success. John McCarthy, who coined the term in 1955, defines it as "the science and engineering of making intelligent machines".

Rígsþula or Rígsmál ("Lay of Ríg") is an Eddic poem in which a Norse god named Ríg or Rígr, described as "old and wise, mighty and strong", fathers the classes of mankind. The prose introduction states that Rígr is another name for Heimdall, who is also called the father of mankind in Völuspá.