James B. Clark (October 14, 1867 – May 14, 1943) was an Ontario farmer and political figure.
He represented Kent East from 1919 to January 1920 as a United Farmers of Ontario member.
He was born in Harwich Township, Ontario, the son of William B. Clark.
Clark also served as a member of the council for Kent County.
He died in Chatham in 1943 and was buried at Evergreen Cemetery at Blenheim.