Henry Simpson (1864–1926) was an architect active in Toronto, Ontario, Canada, around the turn of the 20th century.
[2] He was one of the architects employed by the prominent Massey family, well-known philanthropists.
[3] Simpson worked with Charles J. Gibson from 1888 to 1890.
[4] Over a dozen buildings he designed have survived to the present day.
[5] According to the Biographical Dictionary of Architects in Canada Simpson played a role in the design of 126 buildings from 1891 to 1916.