| Country: | CRI |
| Type: | Tertiary |
| Route: | 503 |
| Map Custom: | yes --> |
| Direction A: | NORTH/SOUTH/EAST/WEST? |
| Direction B: | NORTH/SOUTH/EAST/WEST? |
| Terminus B: | --> |
| Provinces: | Heredia |
| Length Km: | 1.495 |
| Length Round: | 2 |
| Previous Type: | RNT |
| Previous Route: | 502 |
| Next Type: | RNT |
| Next Route: | 504 |
National Tertiary Route 503, or just Route 503 (Spanish; Castilian: Ruta Nacional Terciaria 503, or Spanish; Castilian: Ruta 503) is a National Road Route of Costa Rica, located in the Heredia province.[1]
In Heredia province the route covers San Rafael canton (San Rafael, Santiago districts), San Pablo canton (San Pablo district).