WCSP-FM, also known as C-SPAN Radio, is a radio station owned by the Cable-Satellite Public Affairs Network (C-SPAN) in Washington, D.C. The station is licensed to C-SPAN's corporate owner, the National Cable Satellite Corporation, and broadcasts on 90.1 MHz 24 hours a day. Its studios are located near Capitol Hill in C-SPAN’s headquarters. In addition to WCSP-FM, C-SPAN Radio programming is also available online at c-span.org and via satellite radio on SiriusXM channel 455. WCSP-FM broadcasts in the HD (digital) format.

Cable-Satellite Public Affairs Network is an American cable and satellite television network, created in 1979 by the cable television industry as a nonprofit public service. It televises proceedings of the United States federal government and other public affairs programming. C-SPAN is a private, nonprofit organization funded by its cable and satellite affiliates. It does not have advertisements on any of its television networks or radio stations, nor does it solicit donations or pledges on-air. The network operates independently; the cable industry and the U.S. Congress have no control over its programming content.