| Country: | CRI |
| Type: | Tertiary |
| Route: | 331 |
| Map Custom: | yes --> |
| Direction A: | NORTH/SOUTH/EAST/WEST? |
| Direction B: | NORTH/SOUTH/EAST/WEST? |
| Terminus B: | --> |
| Provinces: | San José, Puntarenas |
| Length Km: | 8.245 |
| Length Round: | 2 |
| Previous Type: | RNT |
| Previous Route: | 330 |
| Next Type: | RNT |
| Next Route: | 332 |
National Tertiary Route 331, or just Route 331 (Spanish; Castilian: Ruta Nacional Terciaria 331, or Spanish; Castilian: Ruta 331) is a National Road Route of Costa Rica, located in the San José, Puntarenas provinces.[1]
In San José province the route covers Pérez Zeledón canton (Pejibaye district).
In Puntarenas province the route covers Buenos Aires canton (Colinas district).