| Opoj | |
| Settlement Type: | Municipality |
| Subdivision Type: | Country |
| Subdivision Name: | Slovakia |
| Subdivision Type2: | Region |
| Subdivision Name2: | Trnava |
| Subdivision Type3: | District |
| Subdivision Name3: | Trnava |
| Pushpin Map: | Slovakia Trnava Region#Slovakia |
| Pushpin Relief: | 1 |
| Pushpin Map Caption: | Location of Opoj in the Trnava Region |
| Coordinates: | 48.3°N 56°W |
| Established Title: | First mentioned |
| Area Total Km2: | 4.61[1] |
| Area Total Sq Mi: | 1.78 |
| Elevation M: | 131[2] |
| Elevation Ft: | 430 |
| Population Total: | 1277[3] |
| Population Density Km2: | 275.77[4] |
| Population Density Sq Mi: | 106.48 |
| Postal Code Type: | Postal code |
| Postal Code: | 919 32 |
| Area Code: | +421 33 |
| Blank Name: | Car plate |
| Blank Info: | TT |
| Website: | www.opoj.sk |
Opoj (hu|Apaj) is a village and municipality of Trnava District in the Trnava region of Slovakia.
The name comes from the Slovak opojiť: to saturate, to soak (with water). Opoj: literally "a land area that is saturated with water" (wet meadow).[5] 1266 Opoy.[5]