| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Opagna | city | Umbria | Italy | 42.65 | 13.10 | 4189 | 1415 |
| Opcina | city | Friuli-Venezia Giulia | Italy | 45.69 | 13.79 | 1171 | 127923 |
| Opcine | city | Friuli-Venezia Giulia | Italy | 45.69 | 13.79 | 1171 | 127923 |
| Opera | city | Lombardia | Italy | 45.37 | 9.20 | 262 | 209700 |
| Opera Arbuticci | city | Sardegna | Italy | 41.22 | 9.47 | 0 | 4895 |
| Opera Arouticci | city | Sardegna | Italy | 41.22 | 9.47 | 0 | 4895 |
| Opera di Poggio Rasu | city | Sardegna | Italy | 41.20 | 9.47 | 0 | 3552 |
| Opera di Poggio Rasu Superiore | city | Sardegna | Italy | 41.20 | 9.47 | 0 | 3552 |
| Opi | city | Abruzzo | Italy | 42.25 | 13.60 | 2926 | 2665 |
| Opi | city | Abruzzo | Italy | 41.78 | 13.83 | 3645 | 1989 |
| Opicina | city | Friuli-Venezia Giulia | Italy | 45.69 | 13.79 | 1171 | 127923 |
| Opicina / Opčine | city | Friuli-Venezia Giulia | Italy | 45.69 | 13.79 | 1171 | 127923 |
| Oppeano | city | Veneto | Italy | 45.30 | 11.18 | 68 | 13044 |
| Oppido Lucano | city | Basilicata | Italy | 40.78 | 16.00 | 1669 | 4835 |
| Oppido Mamertina | city | Calabria | Italy | 38.29 | 15.98 | 997 | 10240 |
| Optschina | city | Friuli-Venezia Giulia | Italy | 45.69 | 13.79 | 1171 | 127923 |
| Optschinach | city | Friuli-Venezia Giulia | Italy | 45.69 | 13.79 | 1171 | 127923 |