Foyil is a town in Rogers County, Oklahoma, United States. It was named for Alfred Foyil, a local landowner and the first postmaster of the town. The population was 344 at the 2010 census, a 47.0 percent increase more than the figure of 234 recorded in 2000.

Foyil is located at 36°26′2″N 95°31′15″W / 36.43389°N 95.52083°W / 36.43389; -95.52083 (36.433792, -95.520707). The town is 10 miles (16 km) northeast of Claremore and 9 miles (14 km) southwest of Chelsea. It lies upon Oklahoma State Highway 66, formerly U.S. Route 66, just south of its junction subsequently Oklahoma State Highway 28. According to the United States Census Bureau, the town has a total Place of 0.4 square miles (1.0 km²), all land.

As of the census of 2000, there were 234 people, 97 households, and 68 families residing in the town. The population density was 657.2 inhabitants per square mile (253.7/km²). There were 112 housing units at an average density of 314.6 per square mile (120.1/km). The racial makeup of the town was 79.06% White, 9.40% Native American, 1.71% from new races, and 9.83% from two or more races. Hispanic or Latino of any race were 2.56% of the population.

There were 97 households, out of which 23.7% had kids under the age of 18 living later than them, 57.7% were married couples buzzing together, 11.3% had a female householder following no husband present, and 28.9% were non-families. 23.7% of whatever households were made taking place of individuals, and 12.4% had someone perky alone who was 65 years of age or older. The average household size was 2.41 and the average family size was 2.83.