| Name | What | Region | Country | Lat | Long | Elev Ft. | Pop Est |
| ‘Obd-e Bayān | city | Ostan-e Khuzestan | Iran | 30.8213889 | 49.3486111 | 78 | 7375 |
| ‘Obeyd | city | Ostan-e Khuzestan | Iran | 31.67 | 48.0222222 | 16 | 7309 |
| ‘Obeyd | city | Ostan-e Khuzestan | Iran | 31.6536111 | 48.7277778 | 101 | 7312 |
| ‘Obeyd-e Gāţe‘ | city | Ostan-e Khuzestan | Iran | 31.5633333 | 48.0327778 | 39 | 7319 |
| ‘Obeyyāt | city | Ostan-e Khuzestan | Iran | 31.67 | 48.0222222 | 16 | 7309 |
| ‘Obeyyāt-e Fenīkhī | city | Ostan-e Khuzestan | Iran | 31.7022222 | 48.0352778 | 36 | 7309 |
| ‘Obūd-e Ka‘b ‘Omeyr | city | Ostan-e Khuzestan | Iran | 31.7297222 | 48.4908333 | 131 | 7305 |
| ‘Olvī Kalā | city | | Iran | 36.5580556 | 51.8941667 | -16 | 6990 |
| ‘Olvī Kolā | city | | Iran | 36.6666667 | 51.4 | -29 | 5817 |
| ‘Olyā | city | Ostan-e Fars | Iran | 30 | 52.8166667 | 5232 | 4015 |
| ‘Olyā | city | Ostan-e Fars | Iran | 29.7022222 | 53.8594444 | 5252 | 3765 |
| ‘Olyā' | city | Ostan-e Tehran | Iran | 35.19 | 51.7475 | 2696 | 48196 |
| ‘Olyā-ye Now | city | Ostan-e Fars | Iran | 29.7038889 | 53.8588889 | 5252 | 3765 |
| ‘Olyājeh | city | | Iran | 37.3344444 | 48.0916667 | 5715 | 9087 |
| ‘Olá | city | Ostan-e Bushehr | Iran | 27.8333333 | 51.8833333 | 0 | 1103 |
| ‘Olūnābād | city | Ostan-e Esfahan | Iran | 32.8144444 | 52.5177778 | 7057 | 4746 |
| ‘Omar | city | Ostan-e Sistan va Baluchestan | Iran | 30.7688889 | 60.5325 | 4110 | 2894 |
| ‘Omar Bāzār | city | Ostan-e Sistan va Baluchestan | Iran | 25.6666667 | 61.3333333 | 75 | 1335 |
| ‘Omar Hūt | city | | Iran | 25.6666667 | 61.0833333 | 78 | 1335 |
| ‘Omar Mel | city | Ostan-e Kermanshah | Iran | 34.3733333 | 47.0319444 | 4288 | 9447 |
| ‘Omar-e Bāgh | city | | Iran | 25.7166667 | 61.05 | 95 | 1335 |
| ‘Omar-e Būq | city | | Iran | 25.7166667 | 61.05 | 95 | 1335 |
| ‘Omari | city | Ostan-e Bushehr | Iran | 28.5080556 | 51.0972222 | 52 | 2390 |
| ‘Omarābād | city | Ostan-e Azarbayjan-e Gharbi | Iran | 37.7333333 | 44.7 | 4986 | 8548 |
| ‘Omarābād | city | Ostan-e Azarbayjan-e Gharbi | Iran | 37.9166667 | 44.8666667 | 5515 | 8659 |
| ‘Omarābād | city | Ostan-e Hamadan | Iran | 35.1 | 49.25 | 5203 | 9031 |
| ‘Omarābād | city | Ostan-e Khorasan | Iran | 33.495 | 59.4891667 | 5980 | 2861 |
| ‘Omarābād | city | Ostan-e Khorasan | Iran | 35.0305556 | 60.9558333 | 2549 | 2814 |
| ‘Omarī | city | Ostan-e Khorasan | Iran | 32.2908333 | 59.3455556 | 6499 | 2903 |
| ‘Omeyr | city | Ostan-e Khuzestan | Iran | 31.2336111 | 48.6077778 | 101 | 7344 |
| ‘Omeyshīyeh-ye Bozorg | city | Ostan-e Khuzestan | Iran | 31.1608333 | 48.515 | 68 | 7351 |
| ‘Omeyshīyeh-ye Kūchek | city | Ostan-e Khuzestan | Iran | 31.075 | 48.5652778 | 55 | 7358 |
| ‘Omleh Teymūr | city | Ostan-e Khuzestan | Iran | 32.18 | 48.2747222 | 259 | 7267 |
| ‘Ommān | city | Ostan-e Hamadan | Iran | 35.3333333 | 49.1166667 | 5928 | 11057 |
| ‘Ommānī | city | Ostan-e Hormozgan | Iran | 27.2541667 | 52.9625 | 160 | 2132 |
| ‘Omrak | city | Ostan-e Tehran | Iran | 35.8538889 | 52.4283333 | 9173 | 47687 |
| ‘Omrābād | city | Ostan-e Hamadan | Iran | 35.1 | 49.25 | 5203 | 9031 |
| ‘Omrān Kandī | city | Ostan-e Azarbayjan-e Sharqi | Iran | 37.3666667 | 46.6666667 | 6099 | 9087 |
| ‘Omrānābād | city | | Iran | 39.0666667 | 47.1666667 | 2988 | 8877 |
| ‘Omrānābād | city | | Iran | 39.4833333 | 47.6 | 606 | 8747 |
| ‘Omrānārād | city | Ostan-e Azarbayjan-e Sharqi | Iran | 39.585 | 47.7486111 | 209 | 7995 |
| ‘Omrānī | city | Ostan-e Khorasan | Iran | 34.56 | 58.7122222 | 3021 | 2828 |
| ‘Omrānī | city | Ostan-e Khorasan | Iran | 34.4747222 | 58.7425 | 3225 | 2832 |
| ‘Omrī | city | Ostan-e Khorasan | Iran | 32.2908333 | 59.3455556 | 6499 | 2903 |
| ‘Omrūdū'īyeh | city | Ostan-e Kerman | Iran | 28.6 | 56.85 | 7486 | 1569 |
| ‘Omshīyeh-ye Kūchek | city | Ostan-e Khuzestan | Iran | 31.075 | 48.5652778 | 55 | 7358 |
| ‘Omār | city | Ostan-e Bushehr | Iran | 28.8530556 | 51.2808333 | 216 | 4144 |
| ‘Omīsheh | city | Ostan-e Khuzestan | Iran | 31.075 | 48.5652778 | 55 | 7358 |
| ‘Omīsheh-ye Kūchek | city | Ostan-e Khuzestan | Iran | 31.075 | 48.5652778 | 55 | 7358 |
| ‘Omūdīyeh | city | Ostan-e Khuzestan | Iran | 31.2941667 | 49.1913889 | 157 | 7337 |
| ‘Omūr | city | Ostan-e Khuzestan | Iran | 31.0544444 | 49.3030556 | 118 | 7358 |
| ‘Onj-e Bālā | city | Ostan-e Khorasan | Iran | 33.5638889 | 57.3922222 | 4458 | 2861 |
| ‘Onşorūd | city | Ostan-e Azarbayjan-e Gharbi | Iran | 37.8194444 | 46.2986111 | 7290 | 9031 |
| ‘Oqleh | city | Ostan-e Khuzestan | Iran | 30.7647222 | 49.0961111 | 49 | 7379 |
| ‘Orbān | city | Ostan-e Khorasan | Iran | 32.5983333 | 59.4180556 | 6653 | 2892 |
| ‘Orfī | city | Ostan-e Khorasan | Iran | 36.1294444 | 59.5227778 | 4730 | 2772 |
| ‘Orsū'īyeh | city | Ostan-e Kerman | Iran | 28.4425 | 56.3702778 | 3418 | 1573 |
| ‘Orveh-ye Soflá | city | Ostan-e Kohgiluyeh va Buyer Ahmad | Iran | 31.0525 | 50.3144444 | 4639 | 5591 |
| ‘Orveh-ye ‘Olyā | city | Ostan-e Kohgiluyeh va Buyer Ahmad | Iran | 31.045 | 50.3205556 | 6249 | 5591 |
| ‘Oryān | city | Ostan-e Khorasan | Iran | 35.2805556 | 59.2347222 | 4402 | 2804 |
| ‘Oryān Tapeh | city | Ostan-e Azarbayjan-e Gharbi | Iran | 38.7016667 | 45.6641667 | 4967 | 8925 |
| ‘Oryān Tappeh | city | Ostan-e Azarbayjan-e Gharbi | Iran | 38.7016667 | 45.6641667 | 4967 | 8925 |
| ‘Orīān | city | Ostan-e Khorasan | Iran | 35.7633333 | 57.5325 | 4786 | 2786 |
| ‘Oseyf | city | Ostan-e Khuzestan | Iran | 30.9833333 | 49.3 | 49 | 7365 |
| ‘Oshshāq | city | Ostan-e Hamadan | Iran | 34.5505556 | 48.6627778 | 7145 | 11156 |
| ‘Oshvand | city | Ostan-e Hamadan | Iran | 34.2 | 48.4833333 | 6870 | 11207 |
| ‘Oshāq | city | Ostan-e Hamadan | Iran | 34.5505556 | 48.6627778 | 7145 | 11156 |
| ‘Os̄mān | city | Ostan-e Kermanshah | Iran | 34.3658333 | 45.94 | 2388 | 9447 |
| ‘Os̄mān | city | Ostan-e Kordestan | Iran | 36 | 47.05 | 6223 | 5863 |
| ‘Os̄mān Bāzār | city | Ostan-e Sistan va Baluchestan | Iran | 25.6666667 | 60.95 | 98 | 1335 |
| ‘Os̄mān Bāzār | city | Ostan-e Sistan va Baluchestan | Iran | 25.6708333 | 60.9580556 | 95 | 1335 |
| ‘Os̄mān Darreh | city | Ostan-e Kordestan | Iran | 35.0333333 | 47.2166667 | 5935 | 6725 |
| ‘Os̄mān Kolā | city | | Iran | 36.5091667 | 51.2263889 | 3605 | 11193 |
| ‘Os̄mān Sarā | city | | Iran | 36.6666667 | 51.15 | 528 | 9283 |
| ‘Os̄mān Ūlan | city | Ostan-e Azarbayjan-e Sharqi | Iran | 36.8833333 | 46.6 | 6305 | 8779 |
| ‘Os̄mānābād | city | Ostan-e Kordestan | Iran | 35.9833333 | 45.9 | 5104 | 5863 |
| ‘Os̄mānābād | city | Ostan-e Golestan | Iran | 36.9688889 | 54.5672222 | 45 | 11123 |
| ‘Os̄māvandān | city | Ostan-e Gilan | Iran | 37.1436111 | 49.3836111 | 193 | 20332 |
| ‘Oveyfī | city | Ostan-e Khuzestan | Iran | 30.9811111 | 49.1025 | 26 | 7365 |
| ‘Owd Mollā | city | Ostan-e Lorestan | Iran | 33.6666667 | 48.75 | 6000 | 7008 |
| ‘Owdeh | city | Ostan-e Khuzestan | Iran | 31.28 | 49.1313889 | 137 | 7340 |
| ‘Owdeh | city | Ostan-e Khuzestan | Iran | 30.7230556 | 49.4908333 | 65 | 7382 |
| ‘Owdeh-ye Pāʼīn | city | Ostan-e Khuzestan | Iran | 30.7230556 | 49.4908333 | 65 | 7382 |
| ‘Owdeh-ye Soflá | city | Ostan-e Khuzestan | Iran | 30.7230556 | 49.4908333 | 65 | 7382 |
| ‘Owl Mollā | city | Ostan-e Lorestan | Iran | 33.6666667 | 48.75 | 6000 | 7008 |
| ‘Owrakī | city | Ostan-e Sistan va Baluchestan | Iran | 25.7211111 | 60.9336111 | 114 | 1335 |
| ‘Oz̄ayyeb | city | Ostan-e Khuzestan | Iran | 32.1361111 | 48.4375 | 160 | 7270 |
| ‘Oz̄eybī | city | Ostan-e Khuzestan | Iran | 31.2947222 | 48.2791667 | 45 | 7337 |
| ‘Oţeysh | city | Ostan-e Khuzestan | Iran | 30.9166667 | 48.6666667 | 32 | 7368 |