| Name | What | Region | Country | Lat | Long | Elev ft. | Pop est |
|---|---|---|---|---|---|---|---|
| Olajak | city | Anatoliki Makedonia kai Thraki | Greece | 41.10 | 24.53 | 2020 | 1456 |
| Old Corinth | city | Peloponnisos | Greece | 37.91 | 22.88 | 341 | 26599 |
| Old Faliron | city | Attiki | Greece | 37.93 | 23.70 | 164 | 798243 |
| Old Mikri Mantineia | city | Peloponnisos | Greece | 36.97 | 22.15 | 229 | 9681 |
| Old Village | city | Dytiki Ellada | Greece | 38.89 | 21.31 | 1122 | 1031 |
| Olejiki | city | Kentriki Makedonia | Greece | 40.60 | 23.47 | 285 | 2555 |
| Oleni | city | Dytiki Ellada | Greece | 37.74 | 21.56 | 334 | 5173 |
| Olimbi | city | Voreio Aigaio | Greece | 38.25 | 25.94 | 830 | 1415 |
| Olimbia Arkhaia | city | Dytiki Ellada | Greece | 37.65 | 21.63 | 167 | 9605 |
| Olimbias | city | Kentriki Makedonia | Greece | 40.59 | 23.78 | 0 | 533 |
| Olimbiaí | city | Peloponnisos | Greece | 36.52 | 22.46 | 1669 | 1218 |
| Olimbiás | city | Dytiki Makedonia | Greece | 40.57 | 21.60 | 2047 | 5041 |
| Olimbiás | city | Thessalia | Greece | 39.99 | 22.25 | 1811 | 1057 |
| Olimbo | city | Notio Aigaio | Greece | 35.74 | 27.17 | 830 | 321 |
| Olimbos | city | Attiki | Greece | 37.78 | 23.95 | 830 | 16054 |
| Olimbos | city | Notio Aigaio | Greece | 35.74 | 27.17 | 830 | 321 |
| Olimpi | city | Voreio Aigaio | Greece | 38.25 | 25.94 | 830 | 1415 |
| Olint | city | Kentriki Makedonia | Greece | 40.29 | 23.34 | 36 | 7732 |
| Olvio | city | Anatoliki Makedonia kai Thraki | Greece | 41.03 | 24.80 | 49 | 3428 |
| Olvion | city | Anatoliki Makedonia kai Thraki | Greece | 41.02 | 24.81 | 39 | 3400 |
| Olvion | city | Anatoliki Makedonia kai Thraki | Greece | 41.03 | 24.80 | 49 | 3428 |
| Olymbia | city | Dytiki Ellada | Greece | 37.65 | 21.63 | 167 | 9605 |
| Olymbiada | city | Kentriki Makedonia | Greece | 40.59 | 23.78 | 0 | 533 |
| Olymbiaki Akti (Strand) | city | Kentriki Makedonia | Greece | 40.24 | 22.59 | 0 | 17104 |
| Olymbos | city | Notio Aigaio | Greece | 35.74 | 27.17 | 830 | 321 |
| Olympiada | city | Kentriki Makedonia | Greece | 40.59 | 23.78 | 0 | 533 |
| Olympiada | city | Dytiki Makedonia | Greece | 40.57 | 21.60 | 2047 | 5041 |
| Olympiada | city | Thessalia | Greece | 39.99 | 22.25 | 1811 | 1057 |
| Olympiai | city | Peloponnisos | Greece | 36.52 | 22.46 | 1669 | 1218 |
| Olympiaki Akti (Beach) | city | Kentriki Makedonia | Greece | 40.24 | 22.59 | 0 | 17104 |
| Olympiaki Akti (Plâge) | city | Kentriki Makedonia | Greece | 40.24 | 22.59 | 0 | 17104 |
| Olympiakí Aktí | city | Kentriki Makedonia | Greece | 40.24 | 22.59 | 0 | 17104 |
| Olympias | city | Kentriki Makedonia | Greece | 40.59 | 23.78 | 0 | 533 |
| Olympias | city | Dytiki Makedonia | Greece | 40.57 | 21.60 | 2047 | 5041 |
| Olympias | city | Thessalia | Greece | 39.99 | 22.25 | 1811 | 1057 |
| Olympies | city | Peloponnisos | Greece | 36.52 | 22.46 | 1669 | 1218 |
| Olynth | city | Kentriki Makedonia | Greece | 40.29 | 23.34 | 36 | 7732 |
| Olynthe | city | Kentriki Makedonia | Greece | 40.29 | 23.34 | 36 | 7732 |
| Olynthos | city | Kentriki Makedonia | Greece | 40.29 | 23.34 | 36 | 7732 |
| Olynthus | city | Kentriki Makedonia | Greece | 40.29 | 23.34 | 36 | 7732 |
| Olá | city | Anatoliki Makedonia kai Thraki | Greece | 41.17 | 24.38 | 1669 | 658 |
| Olímboi | city | Voreio Aigaio | Greece | 38.25 | 25.94 | 830 | 1415 |
| Olýmpoi | city | Voreio Aigaio | Greece | 38.25 | 25.94 | 830 | 1415 |