John Whitmore Horsman (September 24, 1888 – June 10, 1976) was a farmer and political figure in Saskatchewan.
He represented Wilkie from 1948 to 1964 in the Legislative Assembly of Saskatchewan as a Liberal.
He was born in Grand Falls, New Brunswick, the son of D.J.
Horsman and Janet Mary Craven, and was educated there.
Horsman settled on a homestead in the Unity district in 1907.
In 1913, he married Elizabeth Bremner.
He served on the municipal council for the rural municipality of Round Valley, serving as secretary-treasurer from 1918 to 1938 and as reeve from 1941 to 1948.
Horsman also served twenty years on the local school board and was a member of the Unity Hospital board and the Saskatchewan Wheat Pool.