Acoz Castle, also known as the Château Pirmez, is a château in Acoz in the municipality of Gerpinnes, Hainaut, Wallonia, Belgium.

In 1760 the castle came through inheritance into possession of Michel-Joseph d'Udekem de Guertechin (1684-1761). It was owned by d'Udekem d'Acoz family until 1860, when the château was sold to the Pirmez family. During the 19th century it was the home of Belgian author Octave Pirmez.

• List of castles in Belgium

• Château d’Acoz Castles of Hainault^{[permanent dead link‍]}