Marienau Charterhouse, Carthusian monastery in Bad Wurzach, Germany.

Marienau Charterhouse is a Carthusian monastery in Bad Wurzach, Baden-Württemberg, made up of two cloisters, individual monk cells, workshops, a farmhouse, and a guesthouse, all enclosed within a perimeter wall. The buildings have yellow exterior walls, red-tiled roofs, and wooden beam ceilings typical of the regional construction style.

The charterhouse was founded in 1964 after the Maria Hain Charterhouse in Düsseldorf was forced to leave its site because of the expansion of the local airport. The monks relocated to Bad Wurzach, where the new complex was built, and it remains the only active Carthusian monastery in Germany today.

The charterhouse is not open to the public, as Carthusian cloister rules forbid access. The monks live largely in silence, each in his own hermitage around the great cloister, and the community gathers only for services and meals. The monastery's cemetery holds simple wooden crosses without names, and a large cross marks the reburied bones brought from Maria Hain in 1964.

The monastery stands in a secluded woodland spot in Talacker near Bad Wurzach, reached by road; the nearest larger town is Bad Wurzach in the Ravensburg district. The Carthusian rule of enclosure bars the public, so the complex cannot be visited. A 2.5-metre wall about 1.2 kilometres long, pierced by three gates, surrounds the ten-hectare site.

Most Carthusian monasteries are built for 12 monks, but Marienau was designed as a double charterhouse, with space for 24. This makes it one of very few monasteries of this type anywhere in the world.