Oil and gas platforms: O
28 oil and gas platforms
| Platform | Country | Operator | Structure | Project stage |
|---|---|---|---|---|
| OCEANOGRAPHIC BUOY: KFB 11/2012 UNTIL APR2016 | United Kingdom | CEFAS | BUOY | Operating |
| ODA | Norway | Spirit Energy Norway AS | — | Operating |
| ODIN | Norway | Equinor Energy AS | Fixed steel | Decommissioned |
| OFF BOTNEY GROUND | United Kingdom | ROYAL DUTCH SHELL | BUOY | Operating |
| ORMEN LANGE A | Norway | A/S Norske Shell | Subsea steel | Operating |
| ORMEN LANGE B | Norway | A/S Norske Shell | Subsea steel | Operating |
| ORMEN LANGE C | Norway | A/S Norske Shell | Fixed steel | Operating |
| ORMEN LANGE D | Norway | A/S Norske Shell | Subsea steel | Operating |
| OSEBERG A | Norway | Equinor Energy AS | Gravity-based concrete | Operating |
| OSEBERG B | Norway | Equinor Energy AS | Fixed steel | Operating |
| OSEBERG C | Norway | Equinor Energy AS | Fixed steel | Operating |
| OSEBERG D | Norway | Equinor Energy AS | Fixed steel | Operating |
| OSEBERG DELTA | Norway | Equinor Energy AS | Subsea steel | Operating |
| OSEBERG DELTA O | Norway | Equinor Energy AS | — | Operating |
| OSEBERG DELTA P | Norway | Equinor Energy AS | — | Operating |
| OSEBERG H | Norway | Equinor Energy AS | — | Operating |
| OSEBERG SØR | Norway | Equinor Energy AS | Fixed steel | Operating |
| OSEBERG SØR J | Norway | Equinor Energy AS | Subsea steel | Operating |
| OSEBERG SØR K | Norway | Equinor Energy AS | Subsea steel | Operating |
| OSEBERG VESTFLANKE | Norway | Equinor Energy AS | Subsea steel | Operating |
| OSEBERG ØST | Norway | Equinor Energy AS | Fixed steel | Operating |
| OSEBERG-Y | Norway | Equinor Energy AS | Subsea steel | Operating |
| OSELVAR | Norway | — | Subsea steel | Closed down |
| OSI (OFFSHORE STORAGE INST.) | United Kingdom | ENI UK LIMITED | FPSO | Operating |
| ØST FRIGG A | Norway | Aker BP ASA | Subsea steel | Decommissioned |
| ØST FRIGG B | Norway | Aker BP ASA | Subsea steel | Decommissioned |
| ØST FRIGG CMS | Norway | Aker BP ASA | Subsea steel | Decommissioned |
| ØST KAMELEON | Norway | Aker BP ASA | Subsea steel | Operating |