The Polar Bear Express is a Canadian passenger train operated by the Ontario Northland Railway in Northern Ontario. Service was introduced in 1964. While designated as a passenger train, the Polar Bear Express also carries freight and is equipped with specialized equipment including boxcars for canoes, snowmobiles and all terrain vehicles. There are also baggage and express cars. In the past a special car existed for canoes but now these are carried in regular boxcars.

The Ontario Northland Railway is a Canadian railway operated by the Ontario Northland Transportation Commission, a provincial Crown agency of the government of Ontario.