MV Leif Ericson is a commercial passenger/vehicle ferry in service with the Canadian operator Marine Atlantic. She is currently the oldest vessel in the Marine Atlantic fleet. She was built along with two sister ships by the Fosen Yard, Norway in the early 1990s. These two are Oslofjord and Patria Seaways. She also has two half sisters in Gryf and Lider Express. Leif Ericson and Patria Seaways were originally owned by the Swedish Company Stena Line as their Stena Challenger and Stena Traveller respectively.