| Country: | EUR |
| Type: | E |
| Route: | 403 |
| Map Notes: | E-roads in Belgium with E403 in bright green |
| Direction A: | North |
| Terminus A: | Zeebrugge (Belgium) |
| Direction B: | South |
| Terminus B: | Tournai (Belgium) |
| Countries: |  Belgium |
The European route E 403 is a European route connecting the Belgian towns of Zeebrugge and Tournai. This north-south route runs entirely on Belgian territory and falls together with the Belgian roads N31 and A17.
European route E 403 passes through the following towns and cities:
Zeebrugge - Bruges - Torhout - Roeselare - Kortrijk - Tournai
Near Bruges there's a connection with the E 40 and near Kortrijk with the E 17.