The Tournay Castle (French: Château de Tournay) is a castle in the municipality of Pregny-Chambésy, in the Canton of Geneva, Switzerland.

It is classified as Cultural Property of National and Regional Significance.

While it was likely built in the 15th century, no written source provides any details regarding its origins.

In 1758, the Castle and its countal title were acquired by Voltaire under a lifetime lease.

However, the theatrical performances he organised in the Castle attracted the ire of the locals.