Old Main, Augustana College is an historic building located in Rock Island, Illinois, United States.

It was built between 1884 and 1893 on the campus of Augustana College, and it was listed on the National Register of Historic Places in 1975.

The building's dome, which was painted metal, was covered in a copper that has a pre-treated patina to give a weathered, bluish-green look.

Smaller pediments flank the ends of the façade and help to give the structure a balanced appearance.

It is the same quarry that produced the stone blocks that were used to build the shops on nearby Rock Island Arsenal.