CIO may refer to:
Ciopan [ˈt͡ɕɔpan] is a village in the administrative district of Gmina Stanisławów, within Mińsk County, Masovian Voivodeship, in east-central Poland.
The Revolt of the Ciompi was a rebellion among unrepresented labourers which occurred in Florence, Italy from 1378 to 1382. Those who revolted consisted of artisans, labourers, and craftsmen who did not belong to any guilds and were therefore unable to participate in the Florentine government.
The Ciotorogu River is a tributary of the Rusca River in Romania.
Ciomadul is a volcano in Romania. In Hungarian it is known as Csomád. It is in the Carpathians, close to the towns of Băile Tușnad and Bixad.
Ciocci is an Italian surname. Notable people with the surname include:
CIOPORA is the International Community of Breeders of Asexually Reproduced Ornamental and Fruit Varieties (French – Communauté Internationale des Obtenteurs de Plantes Ornamentales et Frutières à Reproduction Asexuée, German - Internationale Gemeinschaft der Züchter vegetativ vermehrbarer Zier- und Obstpflanzen, Spanish - Comunidad Internacional de Fitomejoradores de Plantas ornamentales y frutales de reproducción asexuada).
CIOB may stand for the following:
The Cioara River is a right tributary of the river Arieș in Romania. It discharges into the Arieș in Baia de Arieș.
Ciotusza Stara [t͡ɕɔˈtuʂa ˈstara] is a village in the administrative district of Gmina Susiec, within Tomaszów Lubelski County, Lublin Voivodeship, in eastern Poland.