Cologne Charterhouse, Gothic monastery in Altstadt-Süd, Germany.

Cologne Charterhouse in Altstadt-Süd is a Gothic monastery featuring characteristic medieval architecture with stone walls and pointed arches. The complex comprises individual monk cells, a cloister, and communal spaces that organized daily monastic life.

Archbishop Walram of Jülich issued the foundation charter on 6 December 1334, and the first six monks arrived from Mainz in February 1335. The monastery became the largest charterhouse in Germany. French troops dissolved it in 1794, and the complex was largely rebuilt after World War II.

The church is dedicated to Saint Barbara, whose chapel already stood on the Sencte Mertinsvelt before the monks arrived in February 1335; they kept the dedication but later gave the relics to the neighbouring Franciscans. Since 1928 the Gothic church has served Cologne's Protestant congregation, while the monastery buildings are used for other purposes.

The monastery is accessible to visitors through guided tours offered in different languages to discover its architecture and history. It is wise to check beforehand which areas are open since some rooms are only accessible at certain times.

The church, dedicated to Saint Barbara, has belonged to Cologne's Protestant congregation since 1928. The monastery was dissolved in 1794 when French Revolutionary troops entered Cologne, and the complex was largely rebuilt after being mostly destroyed in World War II.