Old Green is a census-designated place (CDP) in Adair County, Oklahoma, United States.

[4] Old Green is located along the western edge of the town of Westville.

It is 14 miles (23 km) south to Stilwell, the county seat, 26 miles (42 km) west to Tahlequah, 15 miles (24 km) north to West Siloam Springs on the Arkansas border, and 29 miles (47 km) east to Fayetteville, Arkansas.

According to the United States Census Bureau, the CDP has a total area of 3.2 square miles (8.4 km2), of which 0.023 square miles (0.06 km2), or 0.74%, is water.

This Oklahoma state location article is a stub.