KIO (KDE Input/Output) is a system library incorporated into the KDE architecture.

KIO may also refer to:

• Kiō, a Japanese professional shogi title

Kio, stage name of a Soviet magician dynasty

• Emil Kio

• Igor Kio

  Kachin Independence Organisation

• Keep Ireland Open, an organisation that campaigns for open access to the Irish countryside

• An abbreviation of Kibioctet, a unit of information or computer storage

• Kick It Out (organisation), an organisation that aims to keep racism out of football

• Kin On stop (MTR station code: KIO), Hong Kong

• Kuwait Investment Office, the London office of Kuwait Investment Authority

• Sida fallax (), a flowering plant in the Hibiscus family

People:

• , a Japanese manga artist

• YoungKio, stage name of Dutch record producer Kiowa Roukema