Sidney is a town in Sharp County, Arkansas, United States.

[4] According to the United States Census Bureau, the town has a total area of 2.2 square miles (5.7 km2), all land.

The racial makeup of the town was 97.09% White, 1.09% Native American, and 1.82% from two or more races.

26.3% of all households were made up of individuals, and 13.8% had someone living alone who was 65 years of age or older.

About 2.0% of families and 11.0% of the population were below the poverty line, including 7.7% of those under the age of eighteen and 14.8% of those 65 or over.