The United States Courthouse, previously known as Institute Hall, Opera Hall, and Memorial Hall, is a building in Natchez, Mississippi that was initially constructed from 1851 to 1853, for use as an educational building. It has served a variety of public purposes in the intervening years. It was listed on the National Register of Historic Places in 1979. In 2007, it was rededicated as a courthouse of the United States District Court for the Southern District of Mississippi.