| Jánovce | |
| Other Name: | Dunajánosháza |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Type2: | Region |
| Subdivision Name2: | Trnava |
| Subdivision Type3: | District |
| Subdivision Name3: | Galanta |
| Pushpin Map: | Slovakia Trnava Region#Slovakia |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location of Jánovce in the Trnava Region##Location of Jánovce in Slovakia |
| Coordinates: | 48.1767°N 17.5308°W |
| Established Title: | First mentioned |
| Established Date: | 1792 |
| Area Total Km2: | 3.59[1] |
| Area Total Sq Mi: | 1.39 |
| Elevation M: | 120[2] |
| Elevation Ft: | 390 |
| Population Total: | 495[3] |
| Population Density Km2: | 137.45[4] |
| Population Density Sq Mi: | 53.07 |
| Timezone1: | CET |
| Utc Offset1: | +1 |
| Timezone1 Dst: | CEST |
| Utc Offset1 Dst: | +2 |
| Postal Code Type: | Postal code |
| Postal Code: | 925 22 |
| Area Code: | +421 31 |
| Blank Name: | Car plate |
| Blank Info: | GA |
| Website: | www.janovce.sk |
Jánovce (Hungarian: Dunajánosháza, known colloquially as Hungarian: Jánosháza) is a village and municipality in Galanta District of the Trnava Region of south-west Slovakia. It has a population of about 449 people.
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.