Calcutta State Transport Corporation (CSTC) was a West Bengal state government undertaken transport corporation. Headquartered in Kolkata, it was set up on 31 July 1948. Currently it operates under the name WBTC. It plied buses in Kolkata and nearby districts of West Bengal, along with some long-distance services. CSTC owned 11 depots in Kolkata and the districts to station its fleet of busses.