Osage Township is one of twenty-four townships in Bates County, Missouri, and is part of the Kansas City metropolitan area within the USA. As of the 2000 census, its population was 1,837.
The township takes its name from the Osage River.
According to the United States Census Bureau, Osage Township covers an area of 44.86 square miles (116.17 square kilometers); of this, 44.73 square miles (115.84 square kilometers, 99.72 percent) is land and 0.13 square miles (0.33 square kilometers, 0.28 percent) is water.
The township contains these two cemeteries: Fairview Rider and Greenlawn.