Oil gas and minerals
| site link | phone | |
| Daleel Petroleum Company | 24394200 | |
| Dalma Energy | dalmaenergy@dalmaenergy.com | 24636448 |
| Dar Al Sahra Energy | 0 | |
| DEYYAR INTERNATIONAL LLC | 0 | |
| DOHAT AL KHALEEJ L.L.C | info@dakoman.com | 24502867 |
| duqm refinery | 0 | |
| Esnaad Technical Services | 0 | |
| Falcon Oilfield Services | apply@falconofs.com | 24571114 |
| FOS Energy | mycareer@fosenergy.com | 24697589 |
| Global Mining Company | mining1@omantel.net.om | 23219355 |