Robert Henry Preston (March 15, 1840 - December 18, 1926) was an Ontario doctor and political figure.
He was born in Bastard Township, Leeds County in 1840, the son of Anthony Preston, a farmer who came to Upper Canada from Ireland.
His younger brother Richard Franklin Preston was also a physician and politician.
He served as president of the North Crosby and Newboro Agricultural Association.
This article about an Ontario Progressive Conservative Party MPP is a stub.