Okotoks is a town in the Province of Alberta, Canada. It is situated on the Sheep River, approximately 18 km (11 mi) south of the City of Calgary. The town is a member of the Calgary Regional Partnership, a cooperative of municipalities within the Calgary Region. Okotoks has emerged as a bedroom community of Calgary. According to the 2016 Census, the town has a population of 28,881, making it the largest town in Alberta. The town’s name is derived from “ohkotok”, the Blackfoot First Nation word for “rock”. The name may refer to Big Rock, the largest glacial erratic in the Foothills Erratics Train, situated about 7 km (4.3 mi) west of the town.