James Stoddart Duff (June 20, 1856 – November 17, 1916[1]) was an Ontario farmer[2] and political figure.

He represented Simcoe West in the Legislative Assembly of Ontario as a Conservative member from 1898 to 1916.

He was born near Cookstown, Canada East, the son of John Duff, an Irish immigrant, and Eliza Jane Stoddart.

Duff died in office in Alliston, Ontario at the age of 60.

This article about an Ontario Progressive Conservative Party MPP is a stub.