| Country: | CRI |
| Type: | Tertiary |
| Route: | 903 |
| Map Custom: | yes --> |
| Direction A: | NORTH/SOUTH/EAST/WEST? |
| Direction B: | NORTH/SOUTH/EAST/WEST? |
| Terminus B: | --> |
| Provinces: | Guanacaste |
| Length Km: | 29.340 |
| Length Round: | 2 |
| Previous Type: | RNT |
| Previous Route: | 902 |
| Next Type: | RNT |
| Next Route: | 904 |
National Tertiary Route 903, or just Route 903 (Spanish; Castilian: Ruta Nacional Terciaria 903, or Spanish; Castilian: Ruta 903) is a National Road Route of Costa Rica, located in the Guanacaste province.[1]
In Guanacaste province the route covers Nandayure canton (Carmona, Porvenir, Bejuco districts).