Union Base-Ball Grounds

Union Base-Ball Grounds was a baseball park located in Chicago. It was also called White-Stocking Park, as it was the home field of the Chicago White Stockings of the National Association in 1871, after spending the 1870 season as an independent professional club playing home games variously at Dexter Park race course and Ogden Park.

The Great Chicago Fire of October 8 destroyed Union Base-Ball Grounds and all the club's possessions. After fulfilling its 1871 obligations by playing on the road, the club did not field a team for the next two seasons, and the ballpark was not rebuilt.

Union Base-Ball Grounds was "very visibly downtown", its small block bounded on the west by Michigan Avenue, on the north by Randolph Street, and on the east by railroad tracks and the lakeshore, which was then much closer than it is today. The site is now part of Millennium Park.

In 1878 the White Stockings returned to the 1871 site and to a new park that is usually called Lake-Shore Park, Lake Front Park, or simply Lake Park, which was actually the name for the entire waterfront area (not just the ballpark) until being renamed Grant Park in 1901. The team played here through the 1884 season, after which they moved to the first West Side Park.