100 King Street West, formerly known as Stelco Tower, is the third tallest building in Hamilton, Ontario, Canada.

The 103 metres (338 ft), 25-storey office skyscraper was completed in 1972, and is part of the larger Lloyd D. Jackson Square complex.

[3] The building's facade consists of alternating horizontal rows of Stelcoloy steel, and glass windows.

The interior features a large lobby with granite floors, a security desk, a digital directory, and 2 steel-clad elevator banks.

The Jackson Square mall, as well as the 3 other office buildings in the complex are accessible from the lobby level.