The Vorab is a double summit mountain of the Glarus Alps, located on the border between the cantons of Glarus (GL) and Grisons (, GR), Switzerland. The summit () is also named (, referring to ) to distinguish it from a lower summit () named ().
Territorially, it divides on the municipal areas of Laax (GR) on its eastern face, a narrow southern stripe within Siat (GR) and Elm (GL) on its northwestern face. The secondary peaks that belong to the massive include also the municipalities of Ruschein and Panix in Grisons.
The Vorab Glacier runs down the mountain's eastern face, where the valley continues a moderate inclination down towards Flims, where the glacier can be seen, for example, from Lake Cauma. It cannot be seen from the adjacent municipalities on the south, though. The northwestern face, however, consists of a sheer drop towards Elm.
Since 1979, there is a top station of a platter lift near the Glarner Vorab. This comes up from the terminal station of a gondola lift ending at the edge of the glacier, all of these installations belong to the ski resort of Flims-Laax-Falera, which uses the name of Laax only for winter marketing.