The Nicollet County Courthouse and Jail are historic governmental buildings located at 501 South Minnesota Avenue in St. Peter, Minnesota, United States.
The courthouse was designed in a Romanesque Revival style of architecture by noted St. Paul architects Edward P. Bassford and E. W. Stebbins. Construction started and was completed in 1881 at a cost of $26,638. Bohn and Wilce of Winona were the builders. Minor extensions and additions were made in 1917 and 1967. In 1978 a $913,512 3-story addition designed by Wick-Kagermeier-Skaar of Mankato was built on the rear side of the building. A March 28, 1998 tornado damaged the building and after repairs it was reopened in June 2000. The next year a 3-year multimillion-dollar extension and renovation began. The building is now called the Nicollet County Government Center.
The jail was designed in a Queen Anne style of architecture by Winona architect Andrew J. Van Deusen. Construction was started in 1906 and completed in 1907 at an estimated cost of about $22,000.
On September 6, 2002, they were added to the National Register of Historic Places