Old Main is a building on the campus of Augsburg University in Minneapolis, Minnesota, in the Cedar-Riverside neighborhood. It was built in 1901 at a cost of $35,000, designed by the St. Paul firm of Omeyer and Thori and built by Charles F. Haglin, who built other structures such as the Lumber Exchange Building and the Peavey–Haglin Experimental Concrete Grain Elevator. The building, originally known as "New Main", was listed on the National Register of Historic Places in 1983.