| One-Time Decryption Engine | 10 | 205145 |
| Onslaught Map | 3 | 190189 |
| Onslaught Table | 5 | 190190 |
| Onyxia Egg | 6 | 176511 |
| Onyxia Egg Spawner | 5 | 176510 |
| Onyxia\'s Gate | 0 | 177928 |
| Onyxian Whelp Waypoint | 5 | 177944 |
| Onyxias Lair | 14 | 19099 |
| Onyxias Lair | 14 | 19101 |
| Onyxias Lair Piece | 14 | 19100 |
| Oomlot Village -- Warning! Pygmies! | 5 | 202297 |
| Ooze Covered Arcanite Lode | 3 | 123308 |
| Ooze Covered Gold Vein | 3 | 73941 |
| Ooze Covered Iron Deposit | 3 | 73939 |
| Ooze Covered Mithril Deposit | 3 | 123310 |
| Ooze Covered Rich Thorium Vein | 3 | 177388 |
| Ooze Covered Silver Vein | 3 | 73940 |
| Ooze Covered Thorium Vein | 3 | 123848 |
| Ooze Covered Truesilver Deposit | 3 | 123309 |
| Ooze Release Valve | 10 | 201615 |
| Ooze-coated Supply Crate | 3 | 203989 |
| Oozing Fel | 5 | 268632 |
| Op: Gnomeregan Recap Light | 5 | 203862 |
| Open Barrel | 5 | 231199 |
| Open box Murloc | 5 | 246958 |
| Open Crate | 5 | 235311 |
| Open Human Crate | 5 | 233801 |
| Open Prayer Book | 3 | 205537 |
| Open Tent / Small Tent 02 | 5 | 209368 |
| Open To Pass Your Rite. | 3 | 178325 |
| Open Weapon Crate | 5 | 202892 |
| Open Weapon Crate | 5 | 230828 |
| Opened Door 01 | 0 | 214534 |
| Opened Door 02 | 0 | 214535 |
| Opened Door 03 | 0 | 215131 |
| Opened Hozen Crate | 5 | 251495 |
| Operating table | 5 | 267771 |
| Oracle Glade Moonwell | 8 | 19552 |
| Oracle Stone | 8 | 230230 |
| Oradores del agua | 9 | 215780 |
| Orange | 10 | 212257 |
| Orange | 3 | 190624 |
| Orange (Display) | 5 | 190644 |
| Orange Candle | 5 | 195065 |
| Orange Marigolds | 5 | 195307 |
| Orange Marigolds | 5 | 195063 |
| Orange Plague Monster Entrance | 0 | 251454 |
| Orange Plague Monster Entrance | 0 | 201371 |
| Orange Tree | 0 | 211005 |
| Oratory of the Damned Entrance | 0 | 201563 |
| Orb Light | 5 | 243907 |
| Orb of Command | 2 | 179879 |
| Orb of Culmination | 2 | 203254 |
| Orb of Domination | 10 | 177808 |
| Orb of Naxxramas | 10 | 202277 |
| Orb of Naxxramas | 10 | 202278 |
| Orb of Power | 5 | 213523 |
| Orb of Power | 5 | 213524 |
| Orb of Power | 5 | 213525 |
| Orb of Power | 24 | 212091 |
| Orb of Power | 24 | 212092 |
| Orb of Power | 24 | 212093 |
| Orb of Power | 24 | 212094 |
| Orb of Power | 5 | 213447 |
| Orb of Power | 22 | 214514 |
| Orb of the Blue Flight | 10 | 188114 |
| Orb of the Blue Flight | 10 | 188115 |
| Orb of the Blue Flight | 10 | 188116 |
| Orb of the Blue Flight | 10 | 187869 |
| Orb of the Blue Flight | 5 | 188415 |
| Orb of the Nexus | 2 | 188714 |
| Orb of the Nexus | 22 | 188715 |
| Orb of the Sunwell | 5 | 277877 |
| Orb of Translocation | 10 | 182543 |
| Orb of Translocation | 10 | 182546 |
| Orb of Translocation | 10 | 182547 |
| Orb of Translocation | 10 | 182548 |
| Orb of Translocation | 10 | 187428 |
| Orb of Translocation | 10 | 187431 |
| Orb of Translocation | 10 | 181661 |
