CSO or C.S.O. may refer to:
This article is about the county. For the town see Csongrád. For the historical comitatus see Csongrád County (former).
The Csordapásztorok (meaning Shepherds in English) is one of the oldest Hungarian Christmas carols. Its lyrics (with the note "old song") can be found in Benedek Szőlősy's book, the Cantus Catholici, which was first published in 1651. Its music was first recorded in the Deák-Szentes manuscript, which was written between 1741 and 1774 by Mózes Szentes.
CSO Ovidiu is a Romanian professional football club from Ovidiu, Constanța County, Romania, founded in 2004.
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.
Csolnok is a village in Komárom-Esztergom county, Hungary.
Csongor és Tünde is a Hungarian play, written by Mihály Vörösmarty. It was first produced in 1830.
Csonkahegyhát is a village in Zala County, Hungary.
Csobánc [ˈtʃobaːnts] is a hill in the Tapolca Basin, Hungary.
Csongrád (Romanian: Ciongrad; Serbian Cyrillic: Чонград/Čongrad, archaically also Црноград/Crnograd) is a town in Csongrád County in southern Hungary.