 Oilrag Handwraps#16741 · Armor | 31 | — | Hands | Uncommon |
 Oily Blackmouth#6358 · Trade goods | 15 | — | No equipment slot | Common |
 Oilskin Leggings#9414 · Armor | 46 | 40 | Legs | Rare |
 NPC Equip 33456#33456 · Keys | 0 | — | No equipment slot | Poor |
 Gramma Stonefield's Note#1252 · Quest items | 1 | — | No equipment slot | Common |
 NPC Equip 49666#49666 · Weapons | 0 | — | Two-hand | Poor |
 Omarion's Handbook#22719 · Miscellaneous | 60 | 60 | No equipment slot | Common |
 Omar's Gem of POWAH#34835 · Gems | 0 | — | No equipment slot | Epic |
 NPC Equip 44964#44964 · Consumables | 0 | — | No equipment slot | Poor |
 Omega Orb#7749 · Armor | 41 | — | Held in off-hand | Uncommon |
 Omega Rune#38708 · Quest items | 1 | — | No equipment slot | Common |
| Omega Rune#38709 · Quest items | 1 | — | No equipment slot | Common |
 Omen of Ruin#39427 · Weapons | 200 | 80 | One-hand | Epic |
 Ominous Dagger#36671 · Weapons | 138 | 69 | Main hand | Uncommon |
 Fist of Omokk#13167 · Weapons | 60 | 55 | Two-hand | Rare |
 Omokk's Head#12534 · Quest items | 1 | — | No equipment slot | Common |
 Omokk's Girth Restrainer#13959 · Armor | 60 | — | Waist | Rare |
 Omor's Hoof#23886 · Quest items | 0 | — | No equipment slot | Common |
 Omor's Unyielding Will#27464 · Armor | 115 | 70 | Neck | Rare |
 Onin's Report#7715 · Quest items | 1 | 1 | No equipment slot | Common |
 Overlord's Onyx Band#19912 · Armor | 68 | 60 | Finger | Rare |
 Onyx Claymore#3417 · Weapons | 26 | 21 | Two-hand | Rare |
 Onyx Idol#20867 · Quest items | 61 | — | No equipment slot | Rare |
 Onyx Choker#7548 · Armor | 46 | 41 | Neck | Uncommon |
| Onyx Choker#12032 · Armor | 48 | 43 | Neck | Uncommon |
 Onyx Grips#35903 · Armor | 138 | — | Hands | Uncommon |
 Head of Onyxia#18422 · Quest items | 60 | 60 | No equipment slot | Epic |
| Head of Onyxia#18423 · Quest items | 60 | 60 | No equipment slot | Epic |
 Onyxia Scale Breastplate#15141 · Armor | 62 | 57 | Chest | Epic |
 Onyxia Scale Cloak#15138 · Armor | 60 | 55 | Back | Rare |