| Moravský Svätý Ján | |
| Settlement Type: | Village |
| Subdivision Type: | Country |
| Subdivision Name: | Slovakia |
| Subdivision Type2: | Region |
| Subdivision Name2: | Trnava |
| Subdivision Type3: | District |
| Subdivision Name3: | Senica |
| Pushpin Map: | Slovakia Trnava Region#Slovakia |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location of Moravský Svätý Ján in the Trnava Region |
| Coordinates: | 48.5833°N 17.0167°W |
| Established Title: | First mentioned |
| Established Date: | 1449 |
| Area Total Km2: | 39.01[1] |
| Area Total Sq Mi: | 15.06 |
| Elevation M: | 152[2] |
| Elevation Ft: | 499 |
| Population Total: | 2164[3] |
| Population Density Km2: | 55.28[4] |
| Population Density Sq Mi: | 21.34 |
| Postal Code Type: | Postal code |
| Postal Code: | 908 71 |
| Area Code: | +421 34 |
| Blank Name: | Car plate |
| Blank Info: | SE |
| Website: | www.obecmsjan.sk |
| Footnotes: | Source:[5] |
Moravský Svätý Ján (Hungarian: Morvaszentjános) is a village and municipality in Senica District in the Trnava Region of western Slovakia.
In historical records the village was first mentioned in 1449. Under the names SZ.JANOS then ST.JOHANN IN UNGARN in the Austrian Empire.[6] The villages name was until 1918 Morvaszentjános.
The municipality lies at an altitude of 168 metres and covers an area of 39.219 km2. It has a population of about 2074 people.