Ortley is a town in Roberts County, South Dakota, United States.

[7] According to the United States Census Bureau, the town has a total area of 2.24 square miles (5.80 km2), all land.

The racial makeup of the town was 84.6% White, 12.3% Native American, and 3.1% from two or more races.

25.0% of all households were made up of individuals, and 10.7% had someone living alone who was 65 years of age or older.

There were 10.5% of families and 12.9% of the population living below the poverty line, including 8.3% of under eighteens and 20.0% of those over 64.