Sonnwendstein, Mountain summit in Schottwien, Austria.

Sonnwendstein is a mountain summit in Schottwien, Austria, rising to 1523 meters between the Rax massif and the Stuhleck. The slopes are made of limestone and dolomite, and several marked trails reach the top from different directions.

The Friedrich-Schüler-Alpenhaus was built southwest of the summit on 3 October 1886 and burned down completely on 27 February 1938. The Josefskapelle Sonnwendstein was erected at the summit in 1935–1936, and a road was built from the Semmering pass almost to the top for it. A transmitter followed in 1957.

The name Sonnwendstein is not tied to solstice rites; it derives from the old name Hoher Göstritz or Göstritzberg, after the Göstritz hamlet and Göstritzgraben east of Maria Schutz. The Josefskapelle on the summit, built in 1935–1936, is a chapel dedicated to Saint Joseph, reached by a road laid out from the Semmering pass specifically for it.

The summit can be reached from several starting points, including Feistritzsattel, Semmering, Payerbach, Schottwien, and Maria Schutz, with trails suited to different fitness levels. Visiting in the warmer months is advisable, as paths are more accessible and safer.

On clear days, the top offers views toward the Vienna Basin and the Schneeberg and Rax peaks to the north. The panorama opens in almost every direction, which is uncommon for a summit at this elevation in the region.