| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Orbais | city | Wallonie | Belgium | 50.64 | 4.77 | 830 | 5275 |
| Orchies | city | Wallonie | Belgium | 50.65 | 3.25 | 98 | 83670 |
| Orchimont | city | Wallonie | Belgium | 49.89 | 4.93 | 964 | 2970 |
| Orcq | city | Wallonie | Belgium | 50.60 | 3.35 | 180 | 30311 |
| Orcîmont | city | Wallonie | Belgium | 49.89 | 4.93 | 964 | 2970 |
| Ordange | city | Vlaanderen | Belgium | 50.81 | 5.23 | 219 | 31718 |
| Ordenge | city | Vlaanderen | Belgium | 50.81 | 5.23 | 219 | 31718 |
| Ordin | city | Wallonie | Belgium | 50.47 | 4.71 | 393 | 30866 |
| Ordingen | city | Vlaanderen | Belgium | 50.81 | 5.23 | 219 | 31718 |
| Ordinghen | city | Vlaanderen | Belgium | 50.81 | 5.23 | 219 | 31718 |
| Oret | city | Wallonie | Belgium | 50.30 | 4.62 | 830 | 10061 |
| Oreye | city | Wallonie | Belgium | 50.73 | 5.37 | 337 | 11426 |
| Oreye (Bergilers) | city | Wallonie | Belgium | 50.71 | 5.33 | 374 | 18195 |
| Oreye (Grandville) | city | Wallonie | Belgium | 50.73 | 5.35 | 374 | 13582 |
| Oreye (Lens-sur-Geer) | city | Wallonie | Belgium | 50.72 | 5.35 | 374 | 14088 |
| Oreye (Otrange) | city | Wallonie | Belgium | 50.74 | 5.39 | 337 | 9888 |
| Orgeo | city | Wallonie | Belgium | 49.83 | 5.31 | 1236 | 4907 |
| Orival | city | Wallonie | Belgium | 50.62 | 4.30 | 830 | 30095 |
| Orlitain | city | Vlaanderen | Belgium | 50.75 | 3.50 | 78 | 14325 |
| Ormeignies | city | Wallonie | Belgium | 50.60 | 3.75 | 213 | 19880 |
| Ormont | city | Wallonie | Belgium | 50.64 | 3.37 | 62 | 28764 |
| Orolaunum | city | Wallonie | Belgium | 49.68 | 5.82 | 1669 | 19037 |
| Orp-Jauche (Jandrain-Jandrenouille) | city | Wallonie | Belgium | 50.67 | 4.98 | 370 | 10175 |
| Orp-Jauche (Noduwez) | city | Wallonie | Belgium | 50.73 | 4.97 | 282 | 12310 |
| Orp-Jauche (Énines) | city | Wallonie | Belgium | 50.69 | 4.93 | 364 | 12648 |
| Orp-le-Grand | city | Wallonie | Belgium | 50.70 | 4.99 | 331 | 11570 |
| Orp-le-Petit | city | Wallonie | Belgium | 50.70 | 4.99 | 308 | 10899 |
| Orroir | city | Wallonie | Belgium | 50.75 | 3.48 | 78 | 19350 |
| Orsainfaing | city | Wallonie | Belgium | 49.72 | 5.52 | 1105 | 3791 |
| Orsmaal | city | Vlaanderen | Belgium | 50.81 | 5.07 | 127 | 14125 |
| Orsmaal-Gussenhoven | city | Vlaanderen | Belgium | 50.81 | 5.07 | 127 | 14125 |
| Orsmael | city | Vlaanderen | Belgium | 50.81 | 5.07 | 127 | 14125 |
| Orsmael-Gussenhoven | city | Vlaanderen | Belgium | 50.81 | 5.07 | 127 | 14125 |
| Ortheuville | city | Wallonie | Belgium | 50.08 | 5.54 | 1181 | 3142 |
| Ortho | city | Wallonie | Belgium | 50.12 | 5.61 | 1669 | 342 |