Harpster is a village in Wyandot County, Ohio, United States.

According to the United States Census Bureau, the village has a total area of 1.97 square miles (5.10 km2), all land.

There were 90 housing units at an average density of 45.7 per square mile (17.6/km2).

15.7% of all households were made up of individuals, and 10.8% had someone living alone who was 65 years of age or older.

22.4% of all households were made up of individuals, and 15.3% had someone living alone who was 65 years of age or older.