William James Parkhill (December 27, 1840 – May 26, 1913) was an Ontario political figure.
He represented Simcoe South in the Legislative Assembly of Ontario from 1878 to 1883 as a Conservative member.
Around 1861, he was hired by William and Robert Henry who were timber merchants operating near King.
In 1862, he married Anne Jane Crossley, who later ran the general store in Randwick.
Parkhill was the first postmaster for the village and served as reeve for Mulmur Township in 1877.