William Henry Miller (1848–1922) was an American architect and the first graduate of the architecture school at Cornell University in Ithaca, New York.
Born in 1848 in Trenton, New York, Miller graduated from Cornell in 1872. Four years later, he married Emma Halsey of Ithaca.
He was the foremost architect in Ithaca and for Cornell for many years, designing over seventy buildings on and off campus including 9 fraternity houses. Among his buildings for Cornell were the President's House, Barnes Hall, University Library, Boardman Hall, infirmaries, and Prudence Risley Hall. In 1878 he was commissioned by the Cornell University chapter of Alpha Delta Phi to build them a chapter house, it was the first building ever to be designed and built specifically for use by a fraternity as their lodge and residence.Among his other fraternity houses were Deke House, Sigma Chi's chapter house, Chi Phi Lodge, and two former mansions: "Greystone Mansion," originally owned by silent movie actress Irene Castle, and the Jennie McGraw-Willard Fiske mansion, modeled on a French chateau, which became the Chi Psi fraternity house and burned down in 1906. In Ithaca, he also designed the Elizabeth Van Cleef and Robert Treman estates, the Edward G. Wyckoff mansion in Cornell Heights, the old Ithaca High School building (now Dewitt Mall), Cascadilla School, the Stewart Street School, the Savings Bank, the Congregational, Baptist and Unitarian churches, and many other public and private buildings. A home he built for the Stowell family of Ithaca now operates as the William Henry Miller Inn.