| Country: | CRI |
| Type: | Secondary |
| Route: | 121 |
| Map Custom: | yes --> |
| Direction A: | NORTH/SOUTH/EAST/WEST? |
| Direction B: | NORTH/SOUTH/EAST/WEST? |
| Terminus B: | --> |
| Provinces: | San José |
| Length Km: | 14.610 |
| Length Round: | 2 |
| Previous Type: | RNS |
| Previous Route: | 120 |
| Next Type: | RNS |
| Next Route: | 122 |
National Secondary Route 121, or just Route 121 (Spanish; Castilian: Ruta Nacional Secundaria 121, or Spanish; Castilian: Ruta 121) is a National Road Route of Costa Rica, located in the San José province.[1]
In San José province the route covers Escazú canton (San Rafael district), Mora canton (Colón district), Santa Ana canton (Santa Ana, Uruca, Piedades districts).