Oak Grove is a town in Kaufman County, Texas, United States.

According to the United States Census Bureau, the town has a total area of 2.2 square miles (5.6 km2), all land.

There were 265 housing units at an average density of 125.6 per square mile (48.5/km2).

10.9% of all households were made up of individuals, and 4.7% had someone living alone who was 65 years of age or older.

The city is served by the Kaufman Independent School District.