| Official Name: | Osage Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Bourbon |
| Area Total Km2: | 125.33 |
| Area Land Km2: | 125.13 |
| Area Water Km2: | 0.2 |
| Area Total Sq Mi: | 48.39 |
| Area Land Sq Mi: | 48.31 |
| Area Water Sq Mi: | 0.08 |
| Area Water Percent: | 0.16 |
| Population As Of: | 2000 |
| Population Total: | 394 |
| Population Density Km2: | 3.1 |
| Population Density Sq Mi: | 8.2 |
| Elevation M: | 260 |
| Elevation Ft: | 853 |
| Coordinates: | 37.9667°N -94.6669°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0474559 |
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 48.39sqmi 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.