KCSM may refer to:
- KCSM (FM), a radio station (91.1 FM) licensed to San Mateo, California, United States
- KCSM-TV, a television station (channel 43) licensed to San Mateo, California, United States
- Kansas City Southern de México, formerly Grupo Transportación Ferroviaria Mexicana, a Mexican railroad subsidiary of Kansas City Southern
KCSM is a radio station in San Mateo, California, broadcasting locally on 91.1 MHz. The station broadcasts jazz music, 24 hours a day, commercial-free. The radio station is not-for-profit, and listener-supported. The broadcast is mirrored as streaming media on the World Wide Web, extending the station's audience far beyond the Bay Area. Owned by the San Mateo Community College District with sister station KCSM-TV, the station serves the San Francisco Bay Area from studios at the College of San Mateo.