The Erie Federal Courthouse and Post Office, also known as Erie Federal Courthouse, in Erie, Pennsylvania, is a complex of buildings that serve as a courthouse of the United States District Court for the Western District of Pennsylvania, and house other federal functions. The main courthouse building was built in 1937 in Moderne architecture style. It served historically as a courthouse, as a post office, and as a government office building. It was listed on the National Register of Historic Places in 1993. By the late 1980s, the federal courts needed more space to effectively serve the public. To resolve the space shortage, the General Services Administration undertook a bold plan to purchase, restore, and adaptively use two adjacent historic buildings: the Main Library and the Isaac Baker & Son Clothing Store. The existing courthouse was rehabilitated and two additions were constructed.