Hiram Collins Haydn (December 11, 1831 – July, 31, 1913) was an American minister and the fifth President of Western Reserve University, now Case Western Reserve University.

[1] He graduated from Amherst College in 1856 and Union Theological Seminary in 1859.

[2] While president at Western Reserve from 1897–1890, he most notably ended coeducation, instead creating a coordinate system solution[clarification needed], establishing the College for Women, later named Flora Stone Mather College.

[3] Wrote "The History of Presbyterianism in Cleveland," published in 1893 by Winn and Judson,[4] and wrote much of "Annals of the First Presbyterian Church of Cleveland, 1820-1895," in 1895, also published by Winn and Judson.

[5] Haydn died in Cleveland on July 31, 1913, and was buried at Lake View Cemetery.