Jánovce (Hungarian: Dunajánosháza, known colloquially as Jánosháza) is a village and municipality in Galanta District of the Trnava Region of south-west Slovakia.

In historical records the village was first mentioned in 1792.

Before the establishment of independent Czechoslovakia in 1918, it was part of Pozsony County within the Kingdom of Hungary.

The municipality lies at an elevation of 121 metres and covers an area of 3.591 km².

This Trnava Region geography article is a stub.