S-class ferries are roll-on/roll-off (RORO) ferries operated by BC Ferries in British Columbia, Canada. They are the largest ferries in the BC Ferries fleet. The class comprises two ships, Spirit of British Columbia and Spirit of Vancouver Island, which were completed in 1993 and 1994 respectively. They serve the ferry route between Tsawwassen and Swartz Bay. In 2017, the class underwent conversion to a dual-fuel propulsion system that would allow them to use either marine diesel fuel or liquefied natural gas.

MV Spirit of British Columbia is an S-class ferry, part of the BC Ferries fleet active along the British Columbia coast. It and Spirit of Vancouver Island represent the two largest ships in the fleet. The ship was completed in 1993 and serves the Tsawwassen–Swartz Bay route. In 2018, it underwent a mid-life refit that included conversion to a dual-fuel system that allows it to use either marine diesel oil or liquefied natural gas.