4C

4C or IV-C may refer to :
* 4C Array, a cylindrical paraboloid radio telescope at the Mullard Radio Astronomy Observatory
* 4C Entity, a consortium formed by IBM, Intel, Matsushita and Toshiba to establish a common platform for digital rights management schemes
* Long March 4C, a Chinese rocket
* Oflag IV-C, a German Army prisoner-of-war camps for officers in World War II in Colditz Castleand also :
* Fourth Cambridge Survey of Extra-Terrestrial Radio Sources
* Community Coordinated Care for Children ("4c")
* Common Code for the Coffee Community
* AIRES IATA airline code