| Official Name: | Sinclair Township |
| Settlement Type: | Township |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Kansas |
| Subdivision Type2: | County |
| Subdivision Name2: | Jewell |
| Area Total Km2: | 91.52 |
| Area Land Km2: | 88.95 |
| Area Water Km2: | 2.57 |
| Area Total Sq Mi: | 35.34 |
| Area Land Sq Mi: | 34.35 |
| Area Water Sq Mi: | 0.99 |
| Area Water Percent: | 2.81 |
| Population As Of: | 2000 |
| Population Total: | 67 |
| Population Density Km2: | 0.8 |
| Population Density Sq Mi: | 2 |
| Elevation M: | 476 |
| Elevation Ft: | 1562 |
| Coordinates: | 39.8553°N -97.9683°W |
| Blank Name: | GNIS feature ID |
| Blank Info: | 0471897 |
Sinclair Township is a township in Jewell County, Kansas, USA. As of the 2000 census, its population was 67.
Sinclair Township covers an area of 35.34 square miles (91.52 square kilometers); of this, 0.99 square miles (2.57 square kilometers) or 2.81 percent is water.
(This list is based on USGS data and may include former settlements.)
The township contains three cemeteries: Fairview, Laurel Hill and Switzers Gap.