 Olakin's Torch#43524 · Quest items | 1 | — | No equipment slot | Common |
 Olakin's Left Arm#43528 · Quest items | 1 | — | No equipment slot | Common |
 Olakin's Torso#43526 · Quest items | 1 | — | No equipment slot | Common |
 Olakin's Right Arm#43529 · Quest items | 1 | — | No equipment slot | Common |
 Olemba Seed#25745 · Quest items | 1 | — | No equipment slot | Common |
 Olemba Root#25863 · Quest items | 1 | — | No equipment slot | Common |
 Gramma Stonefield's Note#1252 · Quest items | 1 | — | No equipment slot | Common |
 Omega Rune#38708 · Quest items | 1 | — | No equipment slot | Common |
| Omega Rune#38709 · Quest items | 1 | — | No equipment slot | Common |
 Omokk's Head#12534 · Quest items | 1 | — | No equipment slot | Common |
 Omor's Hoof#23886 · Quest items | 0 | — | No equipment slot | Common |
 Onin's Report#7715 · Quest items | 1 | 1 | No equipment slot | Common |
 Onyx Idol#20867 · Quest items | 61 | — | No equipment slot | Rare |
 Head of Onyxia#18422 · Quest items | 60 | 60 | No equipment slot | Epic |
| Head of Onyxia#18423 · Quest items | 60 | 60 | No equipment slot | Epic |
 OOX-09/HL Distress Beacon#8704 · Quest items | 43 | 43 | No equipment slot | Uncommon |
| OOX-17/TN Distress Beacon#8623 · Quest items | 43 | 43 | No equipment slot | Uncommon |
| OOX-22/FE Distress Beacon#8705 · Quest items | 40 | 40 | No equipment slot | Uncommon |
 Opal Runestone#4844 · Quest items | 1 | — | No equipment slot | Common |
 Or'Kalar's Head#4551 · Quest items | 1 | — | No equipment slot | Common |
 Divination Scryer#18746 · Quest items | 1 | — | No equipment slot | Common |
 Oracle Crystal#6442 · Quest items | 1 | — | No equipment slot | Common |
 Orange#38656 · Quest items | 1 | — | No equipment slot | Common |
 Orange Hakkari Bijou#19710 · Quest items | 61 | 58 | No equipment slot | Rare |
 Orc Tooth#18207 · Quest items | 0 | — | No equipment slot | Common |
 Ordanus' Head#5686 · Quest items | 1 | — | No equipment slot | Common |
 Orendil's Cure#5460 · Quest items | 1 | — | No equipment slot | Common |
 Orfus's Bundle#34226 · Quest items | 1 | — | No equipment slot | Common |
 Orik's Crystalline Orb#37577 · Quest items | 1 | — | No equipment slot | Common |
 Orion's Report#28024 · Quest items | 1 | — | No equipment slot | Common |