Henry Girdlestone Acres (1880-1945) was a hydroelectric engineer from St. Catharines, Canada.
[1] Acres was born in Paris, Ontario, and was educated at the University of Toronto.
[2] Acres contributed to the design and oversight of the Chippawa-Queenston Project for the Ontario Hydro-Electric Power Commission and the Shipshaw development in Arvida, Quebec.
[2] The latter was inaugurated in 1942 as the world's largest localized power development.
[2] Throughout his career, he worked with multiple Canadian organizations, including the Hydro-Electric Power Commission of Ontario and Vickers.