Ratnovce (Hungarian: Ratnóc) is a village and municipality in Piešťany District in the Trnava Region of western Slovakia.

The Roman Catholic church of st. Margita Antioch was built there in 1320 and it is still present.

The lower part of the tower and the perimeter wall of the church are dated to the 13th century.

Andrej Škrabal is buried in the church interior under a stone slab that dates back to 1700.

The municipality lies at an altitude of 198 metres and covers an area of 8.456 km².