Frank William Micklethwaite (1849–1925) was a prominent Canadian photographer, professionally known as F. W. Micklethwaite, whose photographs of Toronto and the Muskoka area form an important and unique photographic record of the province of Ontario's history in the late 19th century and early 20th century. Micklethwaite specialized in outside views and landscapes, as well as architectural and commercial photography, and he was one of Toronto's best known photographers. His images of Toronto have been credited for making the 19th century streetscapes come alive.