Altgeld Hall, University building in Carbondale, United States.

Altgeld Hall is the oldest occupied building on the Southern Illinois University Carbondale campus. Chicago architect C. W. Rapp, a Carbondale native, designed it in the Tudor-Gothic style, and M. T. Lewman & Company of Louisville built it. A 2002–2004 renovation by White & Borgognoni added a large wing on the west side.

Construction was authorized by Governor John Peter Altgeld in 1895 as part of expanded state funding for education. Architect C. W. Rapp of Chicago, a Carbondale native, designed it, and M. T. Lewman & Company of Louisville built it. Owen Scott laid the cornerstone on July 21, 1896, and president Harvey W. Everest dedicated the building on December 22, 1896. It originally held the library, physics, chemistry and biology laboratories, and a gymnasium; a 1958 remodeling brought the School of Music, and White & Borgognoni of Carbondale led a 2002–2004 restoration with a west addition.

Altgeld Hall is one of five buildings Governor John Peter Altgeld authorized as "Altgeld's castles"; he pushed for the Tudor-Gothic style he preferred for public buildings, tying the Carbondale structure to the Collegiate Gothic movement. The building now houses the SIUC School of Music, where concerts and recitals are held.

The building houses the Mathematics Department and provides access to its library within. A carillon concert plays from the tower most weekdays at midday, audible from the outdoor spaces nearby.

Altgeld Hall is one of five buildings Governor John Peter Altgeld authorized as "Altgeld's castles"; he pushed for the Tudor-Gothic style he favored for public buildings. The Carbondale structure was designed by C. W. Rapp, a Chicago architect and Carbondale native, and built by M. T. Lewman & Company of Louisville, Kentucky.