| Official Name: | Wauhillau, Oklahoma |
| Settlement Type: | Census-designated place |
| Mapsize: | 260px |
| Subdivision Type: | Country |
| Subdivision Name: | United States |
| Subdivision Type1: | State |
| Subdivision Name1: | Oklahoma |
| Subdivision Type2: | County |
| Subdivision Name2: | Adair |
| Unit Pref: | Imperial |
| Area Footnotes: | [1] |
| Area Total Km2: | 25.41 |
| Area Land Km2: | 25.31 |
| Area Water Km2: | 0.10 |
| Area Total Sq Mi: | 9.81 |
| Area Land Sq Mi: | 9.77 |
| Area Water Sq Mi: | 0.04 |
| Population As Of: | 2020 |
| Population Total: | 307 |
| Population Density Km2: | 12.13 |
| Population Density Sq Mi: | 31.42 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 896 |
| Coordinates: | 35.8642°N -94.7606°W |
| Blank Name: | FIPS code |
| Blank Info: | 40-79150[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2584395 |
Wauhillau is a census-designated place (CDP) in Adair County, Oklahoma, United States. The population was 345 at the 2010 census.[3]
Wauhillau occupies a large rural area in western Adair County. Oklahoma State Highway 51 forms the northeastern edge of the CDP. It is west of Stilwell, the county seat, and southeast of Tahlequah in Cherokee County.
According to the United States Census Bureau, the CDP has a total area of 20.55km2, of which 20.45sqkm is land and 0.1sqkm, or 0.48%, is water.[3]