James Sinclair Smith

James Sinclair Smith (December 27, 1816 – October 4, 1897) was a farmer, livestock breeder and political figure in Ontario, Canada. He represented Middlesex North in the Legislative Assembly of Ontario as a Liberal member from 1867 to 1874.

He was born in Caithness, Scotland in 1816. He served as reeve of McGillivray Township in Middlesex County. He was defeated by John McDougall in the 1875 general election.

Smith was postmaster at Maple Lodge in Middlesex County.

His son Alexander served in the Canadian House of Commons. He died (supposedly) at McGillivray in 1897.