Ermeton Abbey (French: Abbaye d'Ermeton) is a monastery of Benedictine nuns in a medieval castle in the village of Ermeton-sur-Biert, Wallonia, Belgium.

In the early 14th century, John I, Marquis of Namur made Jacquemin de Bossoit lord of Ermeton.

The lordship passed by inheritance for 300 years until bought by ironmaster Richard Godart in 1612.

In 1856, Antoinette de Mérode, princess of Monaco, sold the castle, which in 1870 passed by marriage to the Villermont family.

[2] The community of Benedictine nuns that moved to Ermeton in 1936 had been founded in Brussels in 1917 by Eugène Vandeur, a monk of Maredsous Abbey.