Cottage Grove is a town in Henry County, Tennessee, United States.

[6] According to the United States Census Bureau, the town has a total area of 0.2 square miles (0.52 km2), all land.

24.4% of all households were made up of individuals, and 9.8% had someone living alone who was 65 years of age or older.

There were 21.9% of families and 19.4% of the population living below the poverty line, including 23.1% of under eighteens and none of those over 64.

The climate in this area is characterized by hot, humid summers and generally mild to cool winters.