Mokrý Háj is a village and municipality in Skalica District in the Trnava Region of western Slovakia.
In historical records the village was first mentioned in 1569.
The municipality lies at an altitude of 261 metres and covers an area of 6.871 km². It has a population of about 623 people.
Coordinates: 48°49′N 17°15′E / 48.817°N 17.250°E / 48.817; 17.250