Forest River is a city in Walsh County, North Dakota, United States.

According to the United States Census Bureau, the city has a total area of 0.50 square miles (1.29 km2), all land.

There were 59 housing units at an average density of 118.0 per square mile (45.6/km2).

34.5% of all households were made up of individuals, and 9.1% had someone living alone who was 65 years of age or older.

27.1% of all households were made up of individuals, and 8.5% had someone living alone who was 65 years of age or older.

About 4.8% of families and 9.7% of the population were below the poverty line, including 18.9% of those under the age of eighteen and 10.0% of those 65 or over.