|Cities||Mooreland, Indiana, Lewisville, Indiana, Rushville, Indiana, Columbus, Indiana|
|⁃ location||Columbus, Indiana|
|Mooreland, Indiana, Indiana|
|Length||98 mi (158 km)|
|⁃ left||White River|
The Flatrock River, also known as Flatrock Creek and other variants of the two names, is a 98-mile-long (158 km) tributary of the East Fork of the White River in east-central Indiana in the United States. Via the White, Wabash and Ohio rivers, it is part of the watershed of the Mississippi River, draining an area of 532 square miles (1,380 km2).
The Flatrock River rises near Mooreland in northeastern Henry County, and flows generally southwestwardly through Rush, Decatur, Shelby and Bartholomew counties, past the communities of Lewisville, Rushville and St. Paul. It joins the Driftwood River at Columbus to form the East Fork of the White River. The New Hope Bridge and Pugh Ford Bridge span the river in Bartholomew County, Indiana.
The United States Board on Geographic Names settled on "Flat Rock River" as the stream's name in 1917, and changed it to "Flatrock River" in 1959. According to the Geographic Names Information System, it has also been known historically as "Big Flat Rock River," "Big Flatrock River," "Flat Rock Creek," and "Flatrock Creek."
- U.S. Geological Survey Geographic Names Information System: Flatrock River
- U.S. Geological Survey. National Hydrography Dataset high-resolution flowline data. The National Map Archived 2012-04-05 at WebCite, accessed May 19, 2011
- Columbia Gazetteer of North America entry
- Simons, Richard S. (1985). The Rivers of Indiana. Bloomington, Indiana: Indiana University Press. ISBN 0-253-17476-7
- DeLorme (1998). Indiana Atlas & Gazetteer. Yarmouth, Maine: DeLorme. ISBN 0-89933-211-0
- U.S. Geological Survey Geographic Names Information System: Little Flatrock River