Compesières Commandry, Medieval commandry in Bardonnex, Switzerland.

Compesières Commandry is a fortified house beside the Romanesque church of Saint-Sylvestre in the hamlet of Compesières, Bardonnex. The Knights Hospitaller built the oldest parts in the late 14th to early 15th century, and the complex was later enlarged and ringed by walls with round towers. It now houses the Bardonnex town hall, the parish office and a museum room.

The church of Saint-Sylvestre, built on Roman foundations, was first recorded in 1270 when Bishop Aymon de Cruseilles gave it to the Order of Saint John of Jerusalem, which installed a hospice there. Between the late 14th and early 15th century the order built the fortified house beside it, making it the seat of the Genevois commandry within the langue d'Auvergne. In 1536 the Bernese took the site and used the castle as their bailiff's residence until 1567; Henri IV intervened to protect it during the Savoy-Geneva wars around 1600. The order recovered it in 1617 and held it until the French Revolution.

The Knights' Hall ceiling is divided into 165 painted coffers arranged in five bays by the main beams, bearing religious and heraldic symbols. The decoration dates from the wars of the late 16th century, when Henry IV intervened to protect the building from destruction. The hall is also called the salle des chevaliers.

The château stands in the hamlet of Compesières, in the commune of Bardonnex south of Geneva. The town hall and the parish office still occupy it, so visits centre on the Order of Malta museum room, open only by appointment. Contact the commune in advance to arrange access.

During the French Revolution, the commandry was transformed into a saltpeter factory after its towers and church steeple were demolished. This unexpected repurposing shows how the building survived turbulent times.