The Ober Gabelhorn (4063 m) is a mountain in the Pennine Alps in Switzerland, located between Zermatt and Zinal. The Ober Gabelhorn lies in the Swiss canton of Valais at the southern end of the Zinal valley (part of the Val d'Anniviers). It rises, together with the Dent Blanche (west) and the Zinalrothorn (north), above the Zinal Glacier. On the south side lies the Zmutt Glacier in the valley of Zmutt, which extends west of Zermatt.
The Ober Gabelhorn has a pyramidal shape, similar to the nearby Matterhorn but on a smaller scale. Only the smooth north face is completely glaciated, the other faces being mostly rocky. The south-west ridge is called the Arbengrat while the north-north-west ridge is the Arête du Coeur. The south-east ridge looking over the Ober Gabeljoch (3,597 m) is the Gabelhorngrat. The Wellenkuppe is a lower prominence on the north-east ridge; it is usually climbed as part of the normal route. Huts serving the peak are the Rothorn Hut (3,198 m), the Grand Mountet Hut (2,886 m) and the Arben Bivouac (3,224 m).