Tetbury has since 1981 been twinned with Zwingenburg in Germany. Zwingenberg lies in the Bergstraße district of southern Hesse, south of Frankfurt and Darmstadt. Zwingenburg is the oldest town on the Hessian Bergstraße.
Tetbury recently partnered with the charming French town of Châtillon sur Indre. Châtillon sur Indre is a town of some 3000 inhabitants. The town winds its 45 km2 around the 12th century feudal dungeon. The Renaissance houses in Châtillon sur Indre town centre add to the medieval character of the town.