Schloss Monaise, Château and cultural heritage monument in Euren, Trier, Germany.

Schloss Monaise is a castle with early classical architecture in Trier, featuring formal reception rooms on the first floor and servant quarters above. A grand terrace and ornate staircase define its appearance and offer views over the surrounding landscape.

François Ignace Mangin built the castle between 1779 and 1783 for Philipp Franz Wilderich Nepomuk von Walderdorf, a cathedral dean of Trier. Following extensive restoration work from 1992 to 1997, it was converted into a restaurant and remained under the city of Trier's ownership.

The name derives from the French "mon aise" (my ease, my leisure), matching the Latin motto under the coat of arms, "Otium cum dignitate". A second tradition records a different Latin inscription: "Otiosis locus hic non est. Discede morator" — this is no place for idlers, be gone, loiterer. The building served as a summer residence and pleasure palace (Lustschloss).

Schloss Monaise stands in Trier's Euren district, on the left bank of the Mosel, and has belonged to Euren since the 1853 boundary dispute. The building is owned by the city of Trier and has housed a restaurant since its renovation between 1992 and 1997. The adjoining Hofgut is now a riding facility of the Post-Sportverein Trier. An industrial and commercial estate now occupies land that once belonged to the property, so the original rural setting survives only in part.

The name comes from the French "mon aise" (my ease), and a Latin motto under the coat of arms reads "Otium cum dignitate". To clear the site for the summer residence, the Oberkirch hamlet of Niederkirch was demolished in the 1770s. The former estate lands now hold an industrial and commercial zone, so the original rural setting survives only in part.