Sinacher Gupf, Mountain summit in Carinthia, Austria

Sinacher Gupf (Slovene: Psinjski vrh) is a 1,577 m forepeak of the Karawanks in Carinthia, Austria. A nearly straight west-east ridge rises evenly to a pyramidal summit, while the north and south flanks are steep and pathless. Above the Krischnigsattel at about 1,250 m the mountain forms a plateau with the Dreieralm alp.

The summit is built of Wetterstein limestone and dolomite of Ladinian and Carnian age, up to 1200 m thick. The periadriatic fault line runs south of the peak over the Krischnigsattel, separating the Karawanks foothills, still part of the Eastern Alps, from the Southern Alps beyond. The Strugarjach fault cuts the Dreieralm and Strugarjach on the south side. During the Quaternary the Drau glacier covered the mountain with ground moraine.

The mountain's German name comes from the hamlet of Sinach (Slovene: Sine) on a plateau at about 600 m at its northern foot; the Slovene name Psinjski vrh relates to the same settlement. The ridge itself forms the municipal boundary between Feistritz im Rosental and Ferlach, and scattered farms of Strugarjach (Strugarje) lie on the southern slopes up to about 1150 m.

Hikers can use several marked trails to reach the summit throughout the year, with spring and summer providing the easiest walking conditions. Proper equipment for altitude and changing weather is advisable for a safe visit.

The summit lies entirely in Austria, in the municipality of Feistritz im Rosental; the state border with Slovenia runs along the main Karawanks chain further south, so no three-country view exists. The ridge itself forms the municipal boundary between Feistritz im Rosental and Ferlach, with Windisch Bleiberg on the southern side.