Ely Hall is a two-story Richardsonian Romanesque classroom and laboratory building on the campus of Vassar College in the town of Poughkeepsie, New York, US. Designed by William Tubby and originally built in 1889 as the Alumnae Gymnasium, the structure once featured a large pool and a variety of other athletic spaces. Vassar's enrollment quickly outgrew the limited space within the building and it was first expanded and then superseded by Kenyon Hall in the 1930s. The Geology Department moved into the building shortly thereafter and Ely is now home to Vassar's Department of Earth Science and Geography, the A. Scott Warthin, Jr. Museum of Geology and Natural History, and the Aula, a spacious, frequently used gathering space that was once a basketball court.