Walter Rolleston Lightfoot Blackwell (September 26, 1890 – January 21, 1957) was a Canadian architect known for his work in Peterborough, Ontario, and a number of Bank of Toronto branches across Ontario.
He was the son of William Blackwell and an early partner of Eberhard Zeidler.
His father was the son of English immigrants who were among the first settlers of Douro Township in Peterborough County.
[2] In 1919, he returned to Canada and joined his father's firm in Peterborough.
[3] Between 1919 and 1950, Blackwell designed Bank of Toronto branches in Havelock, Bethany, New Lowell, Penetanguishene, Markdale, Brockville, Oakville, Sudbury, Toronto, London, Newmarket and Hamilton.