| Official Name: | Old Green, 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: | 8.18 |
| Area Land Km2: | 8.14 |
| Area Water Km2: | 0.04 |
| Area Total Sq Mi: | 3.16 |
| Area Land Sq Mi: | 3.14 |
| Area Water Sq Mi: | 0.02 |
| Population As Of: | 2020 |
| Population Total: | 310 |
| Population Density Km2: | 38.08 |
| Population Density Sq Mi: | 98.63 |
| Timezone: | Central (CST) |
| Utc Offset: | -6 |
| Timezone Dst: | CDT |
| Utc Offset Dst: | -5 |
| Elevation Ft: | 1060 |
| Coordinates: | 35.9844°N -94.6039°W |
| Blank Name: | FIPS code |
| Blank Info: | 40-55285[2] |
| Blank1 Name: | GNIS feature ID |
| Blank1 Info: | 2584387 |
Old Green is a census-designated place (CDP) in Adair County, Oklahoma, United States. The population was 315 at the 2010 census.[3]
Old Green is located along the western edge of the town of Westville. U.S. Route 62 runs east–west through the center of the community, and U.S. Route 59, running north–south, forms most of the eastern border. It is south to Stilwell, the county seat, west to Tahlequah, north to West Siloam Springs on the Arkansas border, and east to Fayetteville, Arkansas.
According to the United States Census Bureau, the CDP has a total area of 8.4km2, of which 0.06sqkm, or 0.74%, is water.[3]