MS Chi-Cheemaun is a Canadian passenger and vehicle ferry in Ontario, Canada, which traverses Lake Huron between Tobermory on the Bruce Peninsula and South Baymouth on Manitoulin Island.

Literally translated, "chi-cheemaun" (in folk orthography or chi-jiimaan in the more standard Fiero double vowel spelling) means "big canoe" in Ojibwe.

A trip aboard Chi-Cheemaun is a long standing Great Lakes tradition dating back to the 1930s when a small, wooden vessel, Kagawong, first ferried vehicles across the Georgian Bay between Tobermory and South Baymouth.

Like her predecessors on Lake Huron, Chi-Cheemaun is owned by Owen Sound Transportation Company Limited, an agency of the Ontario Ministry of Transportation (MTO) Chi-Cheemaun makes the 40 km (25 mi) trip in about one hour and 45 minutes, three times each day during peak season and twice a day (with an extra trip Fridays) during May/June and September/October.

[3] From 1989 to 1992, her sister ship, MS Nindawayma, ran the same route, but was retired because of service problems leading to public dissatisfaction and sat rusting in Owen Sound, Ontario.