DeCew House (variably spelt DeCow, Du Coo or DeCou) was built c.1808 in Thorold Township, Upper Canada.

The house is remembered as the destination of Laura Secord's celebrated journey to warn the British of a planned American attack.

Thanks to her warning, FitzGibbon was prepared for the attack, and in the ensuing Battle of Beaver Dams was able to secure the surrender of an American force of approximately 500 men.

Most of the surrounding land was flooded to create Lake Gibson as a reservoir for hydroelectric power generation purposes.

[6] Despite this, the City of Thorold assumed ownership of the DeCou House in early 2011 from the Ontario Power Generation for a nominal fee, completing a restoration project in October of that year.