• International Labour Organization, a specialized agency of the United Nations that deals with labour issues, headquartered in Geneva, Switzerland, founded in 1919
• International Left Opposition, founded by Trotsky in 1930; was meant to be an opposition group within the Comintern; renamed the International Communist League (ICL) in 1933
• Integrated Lights-Out, an embedded server management technology exclusive to Hewlett-Packard; similar in functionality to the Lights out management (LOM) technology of other vendors
• International Linguistic Olympiad, the newest in the group of International Science Olympiads, with problems covering the main fields of theoretical, mathematical and applied linguistics
• Injection locked oscillator, a type of oscillator used in LC circuits
• Intensive livestock operations
• Iloilo International Airport in Iloilo City, the Philippines (IATA: ILO, ICAO: RPVI)

See also

• Ilo (disambiguation)