Coast Mountain Bus Company (CMBC) is the contract operator for bus transit services in Metro Vancouver and is a wholly owned subsidiary of the South Coast British Columbia Transportation Authority, known locally as TransLink, the entity responsible for public transit in the region. The buses form part of the integrated transit network of the Lower Mainland.

TransLink, formally the South Coast British Columbia Transportation Authority and previously the Greater Vancouver Transportation Authority, is the statutory authority responsible for the regional transportation network of Metro Vancouver in British Columbia, Canada, including public transport, major roads and bridges. Its main operating facilities are located in the city of New Westminster.