Hillside Colony is a census-designated place (CDP) and Hutterite colony in Spink County, South Dakota, United States. It was first listed as a CDP prior to the 2020 census. The population of the CDP was 123 at the 2020 census.
It is in the southeast part of the county, bordered to the southeast by Foster Creek, a southwest-flowing tributary of the James River. It is by road south-southeast of Doland and southeast of Frankfort.