Donald Macnish (June 10, 1841 – March 25, 1927) was an Ontario farmer and political figure.
He represented Elgin West in the Legislative Assembly of Ontario from 1894 to 1899 as a Liberal-Patrons of Industry and then a Liberal member.
He was born in Argyleshire, Scotland and came to Canada West with his parents in 1852.
Macnish was an unsuccessful candidate for the federal seat in 1911.
This article about an Ontario Liberal Party MPP is a stub.