Algoma Steel Inc. is an integrated primary steel producer located on the St. Marys River in Sault Ste. Marie, Ontario, Canada. Its products are sold in Canada and the United States as well as overseas. Algoma Steel was founded in 1902 by Francis Clergue, an American entrepreneur who had settled in Sault Ste. Marie. The company emerged from bankruptcy protection in 2004. In April 2007, Algoma Steel was purchased by India's Essar Group for US$ 1.63 billion, continuing operations as a subsidiary known as Essar Steel Algoma Inc. It was purchased again in 2017, by a group of US investors.

Sault Ste. Marie is a city in Ontario, Canada. The third-largest city in Northern Ontario after Sudbury and Thunder Bay, it is located on the St. Mary's River on the Canada–US border. To the southwest, across the river, is the United States and the Michigan city of the same name. The two cities are joined by the Sault Ste. Marie International Bridge, which connects Interstate 75 on the Michigan side to Huron Street on the Ontario side. Shipping traffic in the Great Lakes system bypasses the Saint Mary's Rapids via the American Soo Locks, the world's busiest canal in terms of tonnage that passes through it, while smaller recreational and tour boats use the Canadian Sault Ste. Marie Canal.