Stubenbergsee, Artificial bathing lake in Stubenberg am See, Styria, Austria.

Stubenbergsee is an artificial lake in Styria covering about 40 hectares of water. Summer temperatures reach around 25 degrees Celsius, making it one of Austria's warmest lakes.

Stubenbergsee was created between 1968 and 1971 as an artificial bathing lake below the Styrian village of Stubenberg, at the foot of the Kulm. The municipality of Stubenberg built it and still operates the lake; over the years it added facilities such as the 60-metre water slide, a sand beach and an artificial jumping rock on the east shore.

The lake is owned and run by the municipality of Stubenberg, which has shaped the shore into a family bathing area: a 60-metre water slide, a sand beach, a pirate ship, stone seats and a small lighthouse form a children's zone, while an artificial rock on the east shore provides 1-metre and 3-metre jumping platforms. An electric excursion boat seating 60 can be chartered by groups during the bathing season from late May to September.

Parking is available on the east and north shores, and an entrance fee is charged during the season. A roughly 3 km asphalted path runs around the lake; its completely flat course makes it popular with inline skaters. The electric excursion boat, which holds 60 people, can be chartered by groups during the bathing season from late May to September.

The lake's water is drawn from the Feistritz at the north shore and returned at the southwest corner; a deep-water aeration system prevents overheating. An electric excursion boat seating 60 can be chartered for one-hour trips during the bathing season, from late May to September.