| Nullifying Ward | added | - |
| Numbing Poison | changed | 1 |
| Nutritious Slime Sludge | added | - |
| Oak Mallet | removed | - |
| Oakthrush Staff | changed | 1 |
| Oath of the Sea | removed | - |
| Oblivion Orb | changed | 1 |
| Oblivion's Touch | removed | - |
| Observer's Shield | removed | - |
| Observer's Shield | removed | - |
| Obsessed Prophet's Chestplate | removed | - |
| Obsessed Prophet's Legguards | removed | - |
| Obsessed Prophet's Ornate Boots | removed | - |
| Obsidian Band | removed | - |
| Obsidian Bauble | removed | - |
| Obsidian Blasting Powder | removed | - |
| Obsidian Bomb | removed | - |
| Obsidian Champion | removed | - |
| Obsidian Cleaver | removed | - |
| Obsidian Defender | removed | - |
| Obsidian Destroyer | removed | - |
| Obsidian Edged Blade | removed | - |
| Obsidian Edged Blade | removed | - |
| Obsidian Edged Blade | removed | - |
| Obsidian Greaves | removed | - |
| Obsidian Grinding Stone | removed | - |
| Obsidian Heartseeker | removed | - |
| Obsidian Mail Tunic | changed | 2 |
| Obsidian Mail Tunic | removed | - |
| Obsidian Pendant | removed | - |
| Obsidian Reaver | removed | - |
| Obsidian Sageblade | removed | - |
| Obsidian Scaled Leggings | removed | - |
| Obsidian Scaled Leggings | removed | - |
| Obsidian Scope | removed | - |
| Obsidian Shotgun | removed | - |
| Obsidian Stormhammer | removed | - |
| Obsidian-Infused Thorium Bar | removed | - |
| Occult Poison I | changed | 1 |
| Occult Poison II | changed | 1 |
| Ocean's Breeze | changed | 1 |
| Ocean's Breeze | removed | - |
| Ochre Skeletal Warhorse | added | - |
| Oddly Magical Belt | removed | - |
| Odious Greaves | removed | - |
| Odo's Ley Staff | removed | - |
| Ofalo's Copper Coin | added | - |
| Offering Coin | 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 | - |
| Oglethorpe's Pledge of Secrecy | changed | 1 |
| Ogre Bone | added | - |
| Ogre Forged Hauberk | removed | - |
| Ogre Forged Hauberk | removed | - |
| Ogre Horn Ring | added | - |
| Ogre Lightning Rod | changed | 1 |
| Ogre Pocket Knife | removed | - |
| Ogre Tannin | changed | 1 |
| Ogre Tooth Cleaner | added | - |
| Ogre Toothpick Shooter | removed | - |
| Ogremage Staff | removed | - |
| Ogremind Ring | changed | 1 |
| Ogreseer Fists | removed | - |
| Ogreseer Tower Boots | removed | - |
| Ogreseer Tower Boots | removed | - |
| Ogron's Sash | removed | - |
| Oil Covered Fish | changed | 1 |
| Oil of Immolation | changed | 1 |
| Oil of Olaf | changed | 2 |
| Oilrag Handwraps | changed | 1 |
| Oilskin Leggings | removed | - |
| Oily Blackmouth | changed | 3 |
| Oily Chimaera Hair | added | - |
| Okra | changed | 2 |
| Ol' Reliable | removed | - |
| Olaf's All Purpose Shield | removed | - |
| Old Guard Retaliator | changed | 6 |
| Old Key | changed | 4 |
| OLD Stormwind Seasoning Salts | changed | 1 |
| Old Toolbox | changed | 2 |
| Olgra's Adornments | added | - |
| Olmann Sewar | removed | - |
| Olvek's Guide to Tinctures, Tonics, and Toxins | added | - |
| Ombassa's Hide | added | - |
| Omega Orb | removed | - |
| Omnicast Boots | removed | - |
| Omnicast Boots | removed | - |
| Omnuron's Spear | added | - |
| Omokk's Girth Restrainer | removed | - |
| Once Used Shoe | added | - |
| Oneiric Epiphany | changed | 1 |
| Onslaught Girdle | removed | - |
| Onslaught Girdle | removed | - |
| Onu's Patience | added | - |
| Onyx Choker | removed | - |
| Onyx Claymore | removed | - |
| Onyx Embedded Leggings | changed | 1 |
| Onyx Embedded Leggings | removed | - |
| Onyx Ring | removed | - |
| Onyx Shredder Plate | removed | - |
| Onyxia Blood Talisman | changed | 3 |
| Onyxia Blood Talisman | removed | - |
| Onyxia Hide Backpack | removed | - |
| Onyxia Scale Breastplate | changed | 2 |
| Onyxia Scale Cloak | changed | 1 |
| Onyxia Tooth Pendant | changed | 3 |
| Onyxia Tooth Pendant | removed | - |
| Ooze-ridden Gauntlets | removed | - |
| Ooze-ridden Gauntlets | removed | - |
| Opal Ring | removed | - |
| Opaline Medallion | changed | 1 |
| Opaque Wand | removed | - |
| Optomatic Deflector | changed | 2 |
| Opulent Belt | removed | - |
| Opulent Boots | removed | - |
| Opulent Bracers | removed | - |
| Opulent Cape | removed | - |
| Opulent Crown | removed | - |
| Opulent Gloves | removed | - |
| Opulent Leggings | removed | - |
| Opulent Mantle | removed | - |
| Opulent Robes | removed | - |
| Opulent Tunic | removed | - |
| Orah Raka | removed | - |
| Orange Dye | changed | 2 |
| Orange Qiraji Resonating Crystal | removed | - |
| Orb of Corruption | changed | 1 |
| Orb of Dar'Orahil | changed | 2 |
| Orb of Deception | removed | - |
| Orb of Draconic Energy | changed | 1 |
| Orb of Fire | changed | 1 |
| Orb of Lorica | removed | - |
| Orb of Mistmantle | removed | - |
| Orb of Mystic Insight | added | - |
| Orb of Noh'Orahil | changed | 2 |
| Orb of Power | changed | 1 |
| Orb of Soran'ruk | changed | 4 |
| Orb of Souls | added | - |
| Orb of the Darkmoon | changed | 2 |
| Orb of the Forgotten Seer | removed | - |
| Orc Crusher | changed | 1 |
| Orc Tooth | changed | 1 |
| Orchid Amice | changed | 1 |
| Orcish Battle Bow | changed | 1 |
| Orcish Cleaver | removed | - |
| Orcish Dagger | added | - |
| Orcish Tradeskill Signpost | added | - |
| Orcish War Chain | changed | 1 |
| Orcish War Leggings | changed | 2 |
| Orders from the Commander | removed | - |
| Orders from the Grand Crusader | changed | 1 |
| Orgrimmar Gift Collection | changed | 1 |
| Orgrimmar Pledge Collection | changed | 3 |
| Ornate Adamantium Breastplate | removed | - |
| Ornate Bracers | removed | - |
| Ornate Breastplate | removed | - |
| Ornate Circlet | removed | - |
| Ornate Cloak | removed | - |
| Ornate Dark Iron Bangles | removed | - |
| Ornate Gauntlets | removed | - |
| Ornate Girdle | removed | - |
| Ornate Greaves | removed | - |
| Ornate Legguards | removed | - |
| Ornate Mithril Boots | changed | 2 |
| Ornate Mithril Breastplate | changed | 2 |
| Ornate Mithril Gloves | changed | 2 |
| Ornate Mithril Helm | changed | 2 |
| Ornate Mithril Pants | changed | 2 |
| Ornate Mithril Shoulders | changed | 3 |
| Ornate Pauldrons | removed | - |
| Ornate Shackle Key | added | - |
| Ornate Shield | removed | - |
| Ornate Spyglass | changed | 3 |
| Ornate Spyglass XT | removed | - |
| Ornate Thorium Handaxe | changed | 2 |
| Orphic Bracers | removed | - |
| Orthas' Favorite Gold Tooth | changed | 3 |
| Oscillating Blasthammer | removed | - |
| Oscillating Power Hammer | removed | - |
| Ossirian's Binding | removed | - |
| Ossirian's Binding | removed | - |
| Ostracized Berserker's Chain Greaves | removed | - |
| Ostracized Berserker's Hauberk | removed | - |
| Ostracized Berserker's Legplates | removed | - |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |
| Otherworldly Treasure | changed | 1 |