Richard Franklin Preston (October 24, 1860 – February 8, 1929) was an Ontario physician and political figure.

He was born in Leeds County, Canada West, the son of Anthony Preston, an Irish immigrant, and was educated at Queen's University.

His older brother Robert Henry Preston was also a physician and politician.

Preston ran unsuccessfully for the Lanark North seat in the House of Commons in 1900 and 1904.

He was first elected to the House of Commons in a 1922 by-election held after the death of John Alexander Stewart.