code: 056) is an astronomical and meteorological observatory in the Tatra Mountains of Slovakia.

[1][2] It is located at an altitude of 1,786 metres (5,860 ft) on the south-eastern slopes of Lomnický štít near Tatranská Lomnica.

The observatory is named after a nearby mountain lake (Skalnaté pleso, literally: "Rocky Tarn").

It is also known for its visual comet hunting and for its astrometric observations and discoveries of minor planets.

[2] Noted astronomers who worked at the observatory include Milan Antal, Antonín Mrkos, Ľudmila Pajdušáková and Margita Kresáková (née Vozárová), as well as Alois Paroubek and Regina Podstanická.