Directory List O
| 1 | http://www.odurinde.co.uk/ | PR3 |
| 2 | http://www.ohsearch.org/ | PR3 |
| 3 | http://www.onemilliondirectory.com/ | PR4 |
| 4 | http://www.onemission.com/ | PR4 |
| 5 | http://onebestlink.com/ | PR3 |
| 6 | http://www.onedir.biz/ | PR3 |
| 7 | http://directory.on-net.info/ | PR4 |
| 8 | http://www.oodir.com/ | PR3 |
| 9 | http://www.opendirectorys.com/ | PR3 |
| 10 | http://www.opengrid.org/ | PR4 |
| 11 | http://www.optimizedirectory.com/ | PR4 |
| 12 | http://www.oriency.com/ | PR3 |
| 13 | http://www.originalpages.com/ | PR3 |
| 14 | http://www.ouioo.com/ | PR4 |
| 15 | http://www.ourlifexp.com/directory/ | PR3 |