CSO or C.S.O. may refer to:
Csound is a computer programming language for sound, also known as a sound compiler or an audio programming language, or more precisely, an audio DSL.
This article is about the county. For the town see Csongrád. For the historical comitatus see Csongrád County (former).
Csongrád (Romanian: Ciongrad; Serbian Cyrillic: Чонград/Čongrad, archaically also Црноград/Crnograd) is a town in Csongrád County in southern Hungary.
Csobánc [ˈtʃobaːnts] is a hill in the Tapolca Basin, Hungary.
Csongrád (Hungarian: Csongrád, Serbian: Čongrad or Чонград) was an administrative county (comitatus) of the Kingdom of Hungary.
Csorvás (Romanian: Ciorvaş) is a town in Békés county, in the Southern Great Plain region of south-east Hungary.
Csorna is a town in Győr-Moson-Sopron county, Hungary. Csorna is located near the Fertő-Hanság National Park.