| Oh Great... Plagued Magnataur!
| 10 | 10-30
| | | 10 50
| Borean Tundra |
| Oh No, Ohn'ahra!
| 20 | 20-70
| | | 56 18
| Ohn'ahran Plains |
| Oh Noes, the Tadpoles!
| 10 | 10-30
| | | 10 50
| Borean Tundra |
| Oh Sheepie...
| 15 | 15-35
| | | 13 74
| Valley of the Four Winds |
| Oh Where, Oh Where Can He Be?
| | 1
| | | | Battle Pets |
Oh! So Powerful!
Weekly | | | | | | Dalaran |
| Oh, Deer!
| 30 | 30-35
| | | 13 74
| Mount Hyjal |
| Oh, It's Real
| 15 | 15-30
| | | | Dustwallow Marsh |
| Oh, Ominitron
| 45 | 45
| | | | Stormheim |
| Oh, Rats!
| 80 | 80
| | | 23 40
| Undermine |
| Oh, Ship!
| 45 | 45
| | | | Stormheim |
| Oh, Ship!
| 45 | 45
| | | | Stormheim |
| Oh, the Clawdacity!
| 10 | 10-45
| | | 20 22
| Highmountain |
| Oh, the Insanity!
| 30 | 30-35
| | | 13 74
| Kelp'thar Forest |
| Oh, the Tangled Webs They Weave
| | 1-30
| | | 10 50
| Bloodmyst Isle |
| Ohanzee the Elder
| | 1
| | | | Lunar Festival |
| Ohn'ahran Banners
| 10 | 10-70
| | | | Ohn'ahran Plains |
| Ohn'ahran Plains
| 10 | 10-70
| | | 2 80
| Ohn'ahran Plains |
| Ohn'ahran Plains Rally
| 10 | 10-70
| | | | Ohn'ahran Plains |
| Ohn'ir Elder
| | 1
| | | | Lunar Festival |
Oi Ain't Afraid o' No Ghosts!
Daily | 15 | 15-35
| | | 13 74
| Landfall |
| Oil and Irony
| 15 | 15-30
| | | 10 50
| Felwood |
| Oil Rags to Riches
| 45 | 45
| | | | Engineering |
| Oil Stop
| 20 | 20-35
| | | 13 74
| Kun-Lai Summit |
| Oily Mess
| 50 | 50
| | | | Stormsong Valley |
| Oily Mess
| 50 | 50
| | | | Stormsong Valley |
| Okrilla and the Blasted Lands
| 15 | 15-30
| | | 1 5
| Blasted Lands |
| Okrilla's Revenge
| 10 | 10-40
| | | 16 98
| Blasted Lands |
Okrut Dragonwaste
Daily | | 1
| | | 28 9
| Battle Pets |
| Ol' Blasty
| 10 | 10-30
| | | 10 50
| The Cape of Stranglethorn |
| Olaf, the Big Fella'
| 15 | 15-30
| | | | Badlands |
| Old Age and Treachery
| 30 | 30-35
| | | 13 74
| Dread Wastes |
| Old Allies
| 50 | 50
| | | 11 70
| Horde War Campaign |
| Old Allies
| 50 | 50
| | | 11 70
| Horde War Campaign |
| Old Colleagues
| 50 | 50
| | | 51 48
| Horde War Campaign |
| Old Divisions
| | 1-20
| | | 53
| Gilneas City |
Old Enemies
PvP Daily | 32 | 32-35
| | | 13 74
| Isle of Thunder |
Old Enemies
PvP Daily | 32 | 32-35
| | | 13 74
| Isle of Thunder |
| Old Faces, New Problems
| 50 | 50
| | | 46 80
| Dread Wastes |
| Old Friends
| 30 | 30-40
| | | 1 69
| Spires of Arak |
| Old Friends
| | 1-20
| | | | The Lost Isles |
| Old Friends, Dear Friends
| 70 | 70
| | | 7 2
| Zaralek Cavern |
| Old Friends, New Enemies
| 20 | 20-40
| | | 16 98
| Talador |
| Old Friends, New Opportunities
| 50 | 50
| | | 2 34
| Heritage |
| Old Habits Never Die
| 60 | 60
| | | | Covenant Sanctum |
| Old Hatreds
| 70 | 70
| | | 84 27
| Ohn'ahran Plains |
| Old Hillsbrad
| 15 | 15-30
| | | | Old Hillsbrad Foothills |
| Old Hillsbrad Foothills Reward Quest
| 10 | 10-30
| | | | |
| Old Hillsbrad Foothills Reward Quest
| 30 | 30
| | | | |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old Li Needs Help!
| 10 | 10-60
| | | | Highmountain |
| Old MacDonald
| | 1
| | | 28 9
| Battle Pets |
Old MacDonald
Daily | | 1
| | | 28 9
| Battle Pets |
| Old Man Thistle's Treasure
| 15 | 15-35
| | | | Valley of the Four Winds |
Old Nasha's Paw
Weekly | 50 | 50
| | | | Stormsong Valley |
| Old Puttery
| 15 | 15-30
| | | | Thousand Needles |
| Old R'gal
| 50 | 50
| | | | Zuldazar |
| Old Rotana
| 50 | 50
| | | | Zuldazar |
| Old Soldier
| 50 | 50
| | | 70 20
| Alliance War Campaign |
| Old Soldier
| 50 | 50
| | | 70 20
| War Campaign - Horde |
Old Stomping Grounds
Weekly | 60 | 60
| | | | Abominable Stitching |
| Old Stonetusk
| 30 | 30-70
| | | 56 18
| The Azure Span |
| Old Town
| 50 | 50-80
| | | | |
| Old Tricks Work Best
| 60 | 60
| | | | Korthia |
| Old Whitebark's Pendant
| | 1-30
| | | 10 50
| Eversong Woods |
| Olemba Seed Oil
| 15 | 15-30
| | | 10 50
| Terokkar Forest |
| Olemba Seeds
| 15 | 15-30
| | | 10 50
| Terokkar Forest |
| Olokk the Shipbreaker
| | | | | | |
| Omarion's Second Handbook
| | 1
| | | | Naxxramas |
| Omens and Incense
| 20 | 20-70
| | | 28 9
| Ohn'ahran Plains |
| Omens on the Wind
| 20 | 20-70
| | | 14 4
| Ohn'ahran Plains |
| Omgar Doombow
| 10 | 10-60
| | | | Drustvar |
| Ominous Portents
| 10 | 10-40
| | | 16 98
| Shadowmoon Valley |
| O'mrogg's Warcloth
| 20 | 20-30
| | | 10 50
| The Shattered Halls |
| On a Wing and a Prayer
| 35 | 35
| | | 13 74
| Caverns of Time |
| On Azure Wings
| 45 | 45
| | | | Enchanting |
| On Blackened Wings
| 50 | 50
| | | 23 40
| Through the Shattered Sky |
| On Borrowed Time
| 70 | 70
| | | 28 9
| Dawn of the Infinite |
| On Borrowed Wings
| 45 | 45
| | | | Broken Shore |
| On Brann's Trail
| 25 | 25-30
| | | 10 50
| The Storm Peaks |
| On Cold, Dark Wings
| 73 | 73-75
| | | 11 70
| The Ringing Deeps |
| On Daumyr's Wings
| 45 | 45
| | | 2 2
| Death Knight Campaign |
| On De Other Side
| 60 | 60
| | | 12 87
| Covenant Sanctum |
| On Eagle's Wings
| 10 | 10-45
| | | 5 5
| Trueshot Lodge |
| On Ebon Wings
| 30 | 30-40
| | | 16 98
| Spires of Arak |
| On Even Ground
| 30 | 30-35
| | | 13 74
| Deepholm |
| On Felbat Wings
| 8 | 8-45
| | | 20 22
| Demon Hunter |
| On Ghostly Wings
| 50 | 50
| | | 2 34
| Nazjatar |
On Her Magic-ey Secret Service
Daily | 32 | 32-35
| | | 13 74
| Isle of Thunder |
| On Her Majesty's Secret Service
| 5 | 5-30
| | | 31 50
| Silverpine Forest |
| On Iron Pauldrons
| 15 | 15-30
| | | | Blacksmithing |
| On Larion Wings
| 10 | 10-52
| | | 38 61
| Bastion |
| On Lysonia's Trail
| 60 | 60
| | | 2 57
| Bastion |
| On Nethery Wings
| 25 | 25-30
| | | | Netherstorm |
