Alger (/ˈældʒər/ AL-jər[5]) is a village in Hardin County, Ohio, United States.

Alger was established along the Chicago & Atlantic Railroad and the Ada & Round Head Turnpike, present SR-235.

[7] Alger is located on State Route 235 about 4 miles (6.4 km) south of Ada.

[8] According to the United States Census Bureau, the village has a total area of 0.28 square miles (0.73 km2), all of it land.

27.7% of all households were made up of individuals, and 14.4% had someone living alone who was 65 years of age or older.

The racial makeup of the village was 99.44% White, 0.11% Native American, and 0.45% from two or more races.

29.1% of all households were made up of individuals, and 11.6% had someone living alone who was 65 years of age or older.