| Country: | CRI |
| Type: | Tertiary |
| Route: | 312 |
| Map Custom: | yes --> |
| Direction A: | NORTH/SOUTH/EAST/WEST? |
| Direction B: | NORTH/SOUTH/EAST/WEST? |
| Terminus B: | --> |
| Provinces: | San José |
| Length Km: | 1.255 |
| Length Round: | 2 |
| Previous Type: | RNT |
| Previous Route: | 311 |
| Next Type: | RNT |
| Next Route: | 313 |
National Tertiary Route 312, or just Route 312 (Spanish; Castilian: Ruta Nacional Terciaria 312, or Spanish; Castilian: Ruta 312) is a National Road Route of Costa Rica, located in the San José province.[1]
In San José province the route covers Aserrí canton (Aserrí district).