David Robertson (July 9, 1841 – August 8, 1912) was an Ontario physician and political figure.
He was born in Esquesing Township, Halton County, Canada West in 1841, the son of Alexander Robertson, a Scottish immigrant, and Nancy Moore, a native of New England.
Robertson studied at McGill College and graduated with an M.D.
in 1864.
He first practised medicine in Nassagaweya before moving to Milton.
Robertson was a captain in the local militia and raised a company of volunteers that served during the Fenian raids.
He owned a large amount of real estate, including a large farm.