Brookside is a village in eastern Belmont County, Ohio, United States.

According to the United States Census Bureau, the village has a total area of 0.17 square miles (0.44 km2), all land.

There were 305 housing units at an average density of 1,794.1 per square mile (692.7/km2).

27.0% of all households were made up of individuals, and 12.1% had someone living alone who was 65 years of age or older.

There were 304 housing units at an average density of 1,753.5 per square mile (677.0/km2).

30.4% of all households were made up of individuals, and 18.4% had someone living alone who was 65 years of age or older.