Hale Hall is a historic building of the Ohio State University main campus in Columbus, Ohio. It was built in 1909–1911 and listed on the National Register of Historic Places in 1979. The building was formerly the Ohio Union, and had numerous other names through its history. It was the fourth student union building built in the U.S., and the first at a state university in the country. It is only one of four buildings on campus on the National Register; the others are the Ohio Stadium and Hayes and Orton Halls.