William Arnon Henry (June 16, 1850 – November 24, 1932) was an American academic and agriculturist from Ohio.

Henry attended the National Normal University, teaching to earn money to pay for tuition.

[2] Henry remained at Boulder until 1876, when he became a student of the College of Agriculture and Life Sciences at Cornell University.

During the summer before his senior year, Henry worked as an assistant to Charles Valentine Riley at the United States Entomological Commission.

[1] Henry was commissioned by the Wisconsin State Assembly to study silage and the production of sugar from amber cane.