Irvine Auditorium is a performance venue at 3401 Spruce Street on the campus of the University of Pennsylvania in Philadelphia, Pennsylvania. It was designed by the firm of prominent architect Horace Trumbauer and built 1926–1932. Irvine Auditorium is notable for its nearly 11,000-pipe Curtis Organ, the world's 22nd-largest pipe organ (by ranks), originally built for the Sesquicentennial Exposition of 1926 and donated to the university in 1928. The building was opened in May, 1929.