Gsteig bei Gstaad has an area of 62.41 km² (24.10 sq mi).
 As of 2012, a total of 23.16 km² (8.94 sq mi) or 37.1% is used for agricultural purposes, while 22.6 km² (8.7 sq mi) or 36.2% is forested.
  The rest of the municipality is 0.86 km² (0.33 sq mi) or 1.4% is settled (buildings or roads), 0.78 km² (0.30 sq mi) or 1.2% is either rivers or lakes and 15.01 km² (5.80 sq mi) or 24.0% is unproductive land.

During the same year, housing and buildings made up 0.7% and transportation infrastructure made up 0.6%.
 A total of 28.8% of the total land area is heavily forested and 5.4% is covered with orchards or small clusters of trees.
 Of the agricultural land, 8.7% is pasturage and 28.4% is used for alpine pastures.
 Of the water in the municipality, 0.8% is in lakes and 0.5% is in rivers and streams.
 Of the unproductive areas, 9.2% is unproductive vegetation and 14.6% is too rocky for vegetation.

The municipality lies in an upper valley of the river Saane in the Bernese Oberland and consists of the villages of Gsteig and Feutersoey, plus a number of outlying farms.
The route to the Col du Pillon, an alpine pass, runs through both villages.
Near the pass is the locality of Reusch, where an aerial tramway to the Scex Rouge is operated.

The reservoir Arnensee is located in the municipality.

On 31 December 2009 Amtsbezirk Saanen, the municipality's former district, was dissolved.
 On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Obersimmental-Saanen.
Gsteig bei Gstaad has an area of 62.41 km² (24.10 sq mi).  As of 2012, a total of 23.16 km² (8.94 sq mi) or 37.1% is used for agricultural purposes, while 22.6 km² (8.7 sq mi) or 36.2% is forested.   The rest of the municipality is 0.86 km² (0.33 sq mi) or 1.4% is settled (buildings or roads), 0.78 km² (0.30 sq mi) or 1.2% is either rivers or lakes and 15.01 km² (5.80 sq mi) or 24.0% is unproductive land.
During the same year, housing and buildings made up 0.7% and transportation infrastructure made up 0.6%.  A total of 28.8% of the total land area is heavily forested and 5.4% is covered with orchards or small clusters of trees.  Of the agricultural land, 8.7% is pasturage and 28.4% is used for alpine pastures.  Of the water in the municipality, 0.8% is in lakes and 0.5% is in rivers and streams.  Of the unproductive areas, 9.2% is unproductive vegetation and 14.6% is too rocky for vegetation.
The municipality lies in an upper valley of the river Saane in the Bernese Oberland and consists of the villages of Gsteig and Feutersoey, plus a number of outlying farms. The route to the Col du Pillon, an alpine pass, runs through both villages. Near the pass is the locality of Reusch, where an aerial tramway to the Scex Rouge is operated.
The reservoir Arnensee is located in the municipality.
On 31 December 2009 Amtsbezirk Saanen, the municipality's former district, was dissolved.  On the following day, 1 January 2010, it joined the newly created Verwaltungskreis Obersimmental-Saanen.
Gsteig bei Gstaad