The Polson Iron Works was an Ontario-based firm which built large steam engines, as well as ships, barges and dredges.

In 1888 favourable land grants prompted the company to move to Owen Sound, which was then an important port for Canadian Pacific's steamships.

In Toronto the company's ship yard was located on the harbourfront at the foot of Sherbourne Street (south west at The Esplanade where David Crombie Park and hydro substation now occupies).

In 1914 the company agreed to lease land from the Toronto Harbour Commission to build a new facility in the newly reclaimed Portlands industrial district, but the outbreak of World War I prevented the move.

[3] The engines and hull of Bonnington, a steamboat that ran on the Arrow Lakes from 1911 to 1931, were built at the Polson Iron Works, and shipped by rail to British Columbia.