William Hector MacKenzie (December 10, 1890 – November 2, 1972) was an American politician from New York.
He was born on December 10, 1890, in Mount Healthy, Hamilton County, Ohio.
In 1913, he moved to Wellsville, Allegany County, New York, and began a career in the insurance business.
In 1968, he gave his estate in Belmont to Alfred University, and went to live with his daughter's family in San Diego, California.
Alfred University awards a "William H. MacKenzie Memorial Endowed Scholarship".