| Official Name: | Município de Piraí |
| Mapsize: | 250px |
| Pushpin Map: | Brazil |
| Pushpin Map Caption: | Location of Piraí in Brazil |
| Subdivision Type: | Country |
| Subdivision Type1: | Region |
| Subdivision Type2: | State |
| Subdivision Name: |  Brazil |
| Subdivision Name1: | Southeast |
| Subdivision Name2: | Rio de Janeiro |
| Leader Title: | Prefeito |
| Leader Name: | Luiz Antônio da Silva Neves (PDT) |
| Area Total Km2: | 505.466 |
| Population As Of: | 2020 [1] |
| Population Total: | 29,545 |
| Timezone: | BRT |
| Utc Offset: | -3 |
| Coordinates: | -22.6289°N -43.8978°W |
| Elevation M: | 387 |
| Website: | http://www.pirai.rj.gov.br/ |
| Settlement Type: | Municipality |
| Piraí | |
Piraí (pronounced as /pt/) is a municipality located in the Brazilian state of Rio de Janeiro. Its population was 29,545 (2020) and its area is 505 km².[2]