Kleinsölk is a former municipality in the district of Liezen, in the Austrian state of Styria. It lies in the Sölk Valley, a side valley of the Enns River in the mountainous region of Upper Styria.
As an independent municipality, Kleinsölk was administered within the Liezen district, Austria's largest district by area. Under the 2015 Styria municipal structural reform, which merged a number of small communes across the state, Kleinsölk ceased to be a separate municipality and became part of the newly formed municipality of Sölk.
Since that reform, Kleinsölk has been a cadastral community and locality within Sölk rather than a municipality in its own right. The area is characterised by its alpine setting, with the surrounding landscape dominated by the Niedere Tauern mountain range.