| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Nutritious Food | added | - |
| Obsidian Bomb | changed | 1 |
| Obsidian Champion | changed | 1 |
| Obsidian Defender | changed | 1 |
| Obsidian Destroyer | changed | 1 |
| Obsidian Edged | changed | 1 |
| Obsidian Edged | changed | 1 |
| Obsidian Edged | changed | 1 |
| Obsidian Edged | changed | 2 |
| Obsidian Edged | changed | 1 |
| Obsidian Grinding Stone | changed | 1 |
| Obsidian Heartseeker | changed | 1 |
| Obsidian Insight | changed | 1 |
| Obsidian Insight | changed | 1 |
| Obsidian Mail Tunic | changed | 1 |
| Obsidian Mail Tunic | changed | 1 |
| Obsidian Raptor | changed | 2 |
| Obsidian Reaver | changed | 1 |
| Obsidian Sageblade | changed | 1 |
| Obsidian Scope | changed | 1 |
| Obsidian Scope | changed | 1 |
| Obsidian Shotgun | changed | 1 |
| Obsidian Stormhammer | changed | 1 |
| Occult Poison I | changed | 1 |
| Occult Poison I | changed | 1 |
| Occult Poison II | changed | 1 |
| Occult Poison II | changed | 1 |
| Ochre Skeletal Warhorse | added | - |
| Offensive Stance | changed | 1 |
| Offensive Stance | changed | 1 |
| Offensive State (DND) | added | - |
| Offering of Blood | changed | 1 |
| Offering of Blood | changed | 1 |
| Officer's Belt | added | - |
| Officer's Boots | added | - |
| Officer's Gauntlet | added | - |
| Officer's Gloves | added | - |
| Officer's Pauldrons | added | - |
| Officer's Sabatons | added | - |
| Officer's Waistguard | added | - |
| Officer's Wristguards | added | - |
| Oil of Immolation | changed | 1 |
| Oil of Immolation | removed | - |
| Old Enriched Manna Biscuit | changed | 1 |
| Old Gloomlurker Eye | added | - |
| Old Key | changed | 1 |
| OLDFrost Trap Effect | changed | 1 |
| OLDPhysical Prowess | changed | 1 |
| OLDShield Defense | changed | 1 |
| OLDShield Defense | changed | 1 |
| OLDSoul Link Effect | changed | 1 |
| Omen of Clarity | changed | 4 |
| Omen, self damage | changed | 1 |
| Omen's Moonlight | changed | 1 |
| On Break | added | - |
| On Fire!! | changed | 1 |
| On Thin Ice | added | - |
| On Thin Ice | added | - |
| One-Handed Axes | changed | 1 |
| One-Handed Axes | added | - |
| One-Handed Maces | removed | - |
| One-Handed Maces | added | - |
| One-Handed Swords | changed | 1 |
| One-Handed Swords | added | - |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | changed | 3 |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | removed | - |
| One-Handed Weapon Specialization | removed | - |
| Onin's Camouflage | changed | 1 |
| Onyxia | changed | 1 |
| Onyxia Scale Breastplate | changed | 1 |
| Onyxia Scale Cloak | changed | 2 |
| Onyxia Scale Cloak | changed | 1 |
| Oops! | changed | 1 |
| Ooze Covered Miner | added | - |
| Oozeling's Disgusting Aura | changed | 1 |
| Open Book Visual | added | - |
| Open Bottle | added | - |
| Open Care Package | added | - |
| Open Letter | added | - |
| Open Letter | added | - |
| Open Letter | added | - |
| Open Letter | added | - |
| Open Letter | added | - |
| Open Portal | added | - |
| Open Wound | changed | 1 |
| Open Wound | changed | 1 |
| Open Wound | changed | 1 |
| Open Wound | changed | 1 |
| Open Wound Effect | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | changed | 1 |
| Opening | added | - |
| Opening | added | - |
| Opening | added | - |
| Opening | added | - |
| Opening | added | - |
| Opening | added | - |
| Opening - No Text | changed | 1 |
| Opening Bar Door | changed | 1 |
| Opening Benedict's Chest | changed | 1 |
| Opening Booty Chest | changed | 1 |
| Opening Cage | changed | 1 |
| Opening Chest | changed | 1 |
| Opening Dark Coffer | changed | 1 |
| Opening Greater Scarab Coffer | changed | 1 |
| Opening Relic Coffer | changed | 1 |
| Opening Safe | changed | 1 |
| Opening Scarab Coffer | changed | 1 |
| Opening Secret Safe | changed | 1 |
| Opening Secure Safe | changed | 1 |
| Opening Stratholme Postbox | changed | 1 |
| Opening Strongbox | changed | 1 |
| Opening Termite Barrel | changed | 1 |
| Opportunity | changed | 3 |
| Opportunity | removed | - |
| Opportunity | removed | - |
| Opportunity | removed | - |
| Opportunity | removed | - |
| Optimization - NYI | added | - |
| Oracle Healing Bonus | changed | 1 |
| Oracular Heal | changed | 1 |
| Orange Mageweave Shirt | changed | 1 |
| Orange Mageweave Shirt | removed | - |
| Orange Martial Shirt | changed | 1 |
| Orange Martial Shirt | removed | - |
| Orb of Mystic Insight | added | - |
| Orb of Souls | added | - |
| Orbiting Chakram | added | - |
| Orcish | changed | 1 |
| Orcish Orphan Whistle | changed | 1 |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish War Leggings | changed | 2 |
| Orgrimmar Gift of Friendship | changed | 1 |
| Orgrimmar Reputation | changed | 1 |
| Ornate Mithril Boots | changed | 2 |
| Ornate Mithril Breastplate | changed | 2 |
| Ornate Mithril Gloves | changed | 1 |
| Ornate Mithril Helm | changed | 2 |
| Ornate Mithril Pants | changed | 1 |
| Ornate Mithril Shoulders | changed | 1 |
| Ornate Spyglass | changed | 1 |
| Ornate Spyglass | removed | - |
| Ornate Thorium Handaxe | changed | 1 |
| Out of breath! | changed | 1 |
| Out of breath! | changed | 1 |
| Outlaw's Collar | added | - |
| Overcharge | changed | 1 |
| Overconfidence | changed | 1 |
| Overdrive | changed | 1 |
| Overdrive | changed | 1 |
| Overdrive | added | - |
| Overgrowth | changed | 6 |
| Overgrowth | changed | 1 |
| Overpower | changed | 1 |
| Overpower | removed | - |
| Overpower | changed | 1 |
| Overpower | removed | - |
| Overpower | changed | 1 |
| Overpower | changed | 1 |
| Overpower | removed | - |
| Overpower | removed | - |