Štrbské pleso, Glacial lake in High Tatras, Slovakia.

Štrbské pleso is a moraine glacial lake on the southern side of the High Tatras, at 1,346.6 m, where the Furkotská and Mlynická valleys meet below the Solisko ridge. It measures 19.67 ha, is 640 m long and 600 m wide, and reaches 20 m deep. It has no surface inflow or outflow; the Mlynica stream runs 200 m to the east.

The lake is a moraine glacial lake formed by glacial activity at the junction of the Furkotská and Mlynická valleys. It belonged to the Liptov Szentiványi family until the Hungarian state bought it in 1901. The settlement on its shores arose in 1872 with the first hut, and since 1885 the site has functioned as a climatic spa.

The name comes from the village of Štrba below; locals once called the lake "the puddle." In 1930 Miroslav Slavík proposed renaming it Slovenské pleso, but the idea was rejected. Boat rides have been offered since 1880, and since 1885 the settlement has functioned as a climatic spa.

Štrbské pleso lies at 1,346.6 m, at the end of the cog railway from Štrba and on the Tatranská elektrická železnica line to Starý Smokovec. Trails leave the shore for the Furkotská, Mlynická and Mengusovská valleys, and a chairlift rises to Chata na Solisku. The surface stays frozen about 155 days a year.

The lake has no surface inflow or outflow; the Mlynica stream runs 200 metres to the east. Until human intervention, water also drained toward the Bielý Váh basin, but today it seeps underground only into the Poprad basin. Its surface water averages 6 °C annually, peaking at 19 °C.