Osage Township is a township in Bourbon County, Kansas, USA. As of the 2000 census, its population was 394.

Osage Township covers an area of 48.39 square miles (125.3 km) and contains no incorporated settlements. According to the USGS, it contains four cemeteries: Barnesville, Fairview, Maple Grove and West Liberty.

The Little Osage River and smaller streams of Fish Creek, Indian Creek and Moores Branch run through this township. Fish Creek, Indian Creek and Moores Branch all enter the Little Osage in Osage Township.

Osage Township contains two airports or landing strips: Emmerson Airport and Lyons Field.

• USGS Geographic Names Information System (GNIS)

• City-Data.com
• Bourbon County Maps: Current, Historic Collection