Gsies (German: [ˈɡsiːəs]; Italian: Valle di Casies [ˈvalle di kaˈziːes]) is a valley and comune (municipality) in South Tyrol in northern Italy, located about 70 kilometres (43 mi) northeast of Bolzano, on the border with Austria.

Gsies held the FIL World Luge Natural Track Championships 1994.

As of 30 November 2010, it had a population of 2,256 and an area of 108.7 square kilometres (42.0 sq mi).

The municipality of Gsies contains the frazioni (subdivisions, mainly villages and hamlets) Außerpichl (Colle di Fuori), Innerpichl (Colle di Dentro), St. Magdalena-Niedertal (Santa Maddalena Valbassa), St. Magdalena-Obertal (Santa Maddalena Vallalta), St. Martin-Niedertal (San Martino Valbassa), St. Martin-Obertal (San Martino Vallalta), Oberplanken (Planca di Sopra) and Unterplanken (Planca di Sotto).

[4] According to the 2024 census, 98.11% of the population speak German, 1.80% Italian and 0.09% Ladin as first language.