| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Olba | city | Italy | 44.48 | 8.58 | 1922 | 2337 | |
| Olbicella | city | Italy | 44.53 | 8.58 | 1266 | 3264 | |
| Olcenengo | city | Italy | 45.37 | 8.32 | 433 | 6573 | |
| Olda | city | Italy | 45.88 | 9.55 | 2043 | 3936 | |
| Oldaniga | city | Italy | 45.62 | 9.38 | 616 | 105618 | |
| Oldenico | city | Italy | 45.40 | 8.38 | 426 | 5719 | |
| Oleggio | city | Italy | 45.60 | 8.63 | 656 | 18810 | |
| Olengo | city | Italy | 45.42 | 8.67 | 393 | 51695 | |
| Olevano | city | Italy | 41.87 | 13.03 | 1896 | 16185 | |
| Olevano Romano | city | Italy | 41.87 | 13.03 | 1896 | 16185 | |
| Olevano di Lomellina | city | Italy | 45.22 | 8.72 | 328 | 15104 | |
| Olevano sul Tusciano | city | Italy | 40.67 | 15.02 | 810 | 27417 | |
| Olevole | city | Italy | 42.87 | 12.08 | 800 | 3102 | |
| Olgia | city | Italy | 46.15 | 8.58 | 2070 | 1669 | |
| Olgiasca | city | Italy | 46.12 | 9.32 | 1312 | 12721 | |
| Olgiata | city | Italy | 42.03 | 12.37 | 321 | 146634 | |
| Olgiate | city | Italy | 45.80 | 8.97 | 1167 | 67579 | |
| Olgiate Calco | city | Italy | 45.73 | 9.40 | 853 | 63327 | |
| Olgiate Comasco | city | Italy | 45.80 | 8.97 | 1167 | 67579 | |
| Olgiate Molgora | city | Italy | 45.73 | 9.40 | 853 | 63327 | |
| Olgiate Olona | city | Italy | 45.63 | 8.88 | 698 | 166405 | |
| Olginate | city | Italy | 45.80 | 9.40 | 705 | 70944 | |
| Olibra Incinante | city | Italy | 42.87 | 13.45 | 1509 | 5276 | |
| Olibra Incinesca | city | Italy | 42.87 | 13.52 | 1003 | 19899 | |
| Oliero | city | Italy | 45.85 | 11.67 | 561 | 11304 | |
| Oliva | city | Italy | 38.32 | 15.98 | 688 | 15758 | |
| Olivadi | city | Italy | 38.72 | 16.42 | 1282 | 13779 | |
| Olivaro | city | Italy | 39.27 | 16.68 | 3484 | 5735 | |
| Olivaru | city | Italy | 39.27 | 16.68 | 3484 | 5735 | |
| Oliveto | city | Italy | 44.47 | 11.12 | 623 | 16013 | |
| Oliveto | city | Italy | 43.38 | 11.73 | 885 | 11245 | |
| Oliveto | city | Italy | 42.25 | 12.88 | 1863 | 4443 | |
| Oliveto | city | Italy | 38.05 | 15.70 | 1046 | 59044 | |
| Oliveto | city | Italy | 39.58 | 16.67 | 301 | 18148 | |
| Oliveto Citra | city | Italy | 40.68 | 15.23 | 646 | 9642 | |
| Oliveto Lario | city | Italy | 45.93 | 9.28 | 613 | 10112 | |
| Oliveto Lucano | city | Italy | 40.53 | 16.18 | 1545 | 2317 | |
| Olivetta | city | Italy | 43.88 | 7.50 | 1043 | 4940 | |
| Olivola | city | Italy | 44.22 | 10.02 | 295 | 10814 | |
| Ollano | city | Italy | 44.30 | 8.30 | 1873 | 10516 | |
| Olmeneta | city | Italy | 45.23 | 10.02 | 147 | 11986 | |
| Olmeto | city | Italy | 42.98 | 12.32 | 928 | 11278 | |
| Olmi | city | Italy | 43.87 | 10.98 | 88 | 65306 | |
| Olmo | city | Italy | 45.97 | 9.65 | 2112 | 4108 | |
| Olmo al Brembo | city | Italy | 45.97 | 9.65 | 2112 | 4108 | |
| Oltre il Colle | city | Italy | 45.90 | 9.77 | 3241 | 4116 | |
| Oltressenda Alta | city | Italy | 45.90 | 9.93 | 2388 | 16777 | |
| Oltrona di San Mamette | city | Italy | 45.75 | 8.98 | 1095 | 67076 | |
| Olzano | city | Italy | 45.73 | 10.72 | 265 | 1895 |