Rio Maior
| Rio Maior | |
|---|---|
| Coordinates: 39°20′N 8°56′W / 39.333°N 8.933°W | |
| Country | Portugal | 
| Region | Oeste e Vale do Tejo | 
| Intermunic. comm. | Lezíria do Tejo | 
| District | Santarém | 
| Parishes | 10 | 
| Government | |
| • President | Luís Filipe Santana Dias (PSD) | 
| Area | |
|  • Total | 272.76 km2 (105.31 sq mi) | 
| Population  (2011) | |
|  • Total | 21,192 | 
| • Density | 78/km2 (200/sq mi) | 
| Time zone | UTC+00:00 (WET) | 
| • Summer (DST) | UTC+01:00 (WEST) | 
| Local holiday | November 6 | 
| Website | www | 
Rio Maior (European Portuguese pronunciation: [ˈʁi.u mɐˈjɔɾ] ⓘ) is a municipality in the Santarém District in Portugal. The population in 2011 was 21,192, in an area of 272.76 km².
The present mayor is Isaura Morais of the Social Democratic Party (PSD), the first woman to be elected mayor in the municipality. The municipal holiday is November 6.