The Sphinx Observatory is an astronomical observatory located above the Jungfraujoch in Switzerland. It is named after the Sphinx, a rocky summit on which it is located. At 3,571 m (11,716 ft) above mean sea level, it is one of the highest observatories in the world. Accessible to the public, it is also the second highest observation deck in Switzerland. The mountain top has been tunneled to fit an elevator which ascends to the observatory from the Jungfraujoch railway station, the highest such train station in Europe. The building is located on the Valais side of the border, only a few metres from the canton of Bern, although it is accessed via the Jungfrau Railway from the Bernese Oberland.

The open viewing deck accessible to the public is adjacent to the observatory. It offers views of the Jungfrau, Mönch, and Eiger peaks, all within a few kilometers.