ITO may refer to:

• Hilo International Airport, IATA airport code
• Indium tin oxide, a transparent conductor
• Information Technology Outsourcing
• International Trade Organization
• IT/Operations, an old (but still frequently used) name for HP Operations Manager, a software monitoring suite.
• Jewish Territorialist Organization
• Inventory turnover, a measure of the number of times inventory is sold or used in a certain period of time.
• Involuntary Treatment Order, typically for psychiatric treatment

Ito may refer to:

• Ito (name), for people with the Japanese surname Ito
• Itô calculus
• Ito District, Wakayama, a district located in Wakayama Prefecture, Japan
• Ito, Shizuoka
• Ito, nickname of Antonio Álvarez Pérez, a Spanish footballer
• Ito, nickname of Jorge Delgado Fidalgo, a Spanish footballer
• Ito cell, a fat-storing cell found in the liver; also called a hepatic stellate cell
• I_to1, an abbreviation of cardiac transient outward potassium current
• Ito – a Diary of an Urban Priest, a 2010 documentary film by Pirjo Honkasalo
• Ito-toren, an office building in Amsterdam

Ito may refer to:

• Ito (name), a common Japanese family name

Itō (伊藤) is the sixth most common Japanese family name. Other ways of writing of this name are for example 伊東 and 伊都. Phonetically they are the same. Surnames with this sound can also be romanized as Ito, Itou or Itoh.