OP may refer to:
- Abaddon
- Alchemist
- Ancient Apparition
- Anti-Mage
- Arc Warden
- Axe
- Bane
- Batrider
- Beastmaster
- Bloodseeker
- Bounty Hunter
- Brewmaster
- Bristleback
- Broodmother
- Centaur Warrunner
- Chaos Knight
- Chen
- Clinkz
- Clockwerk
- Crystal Maiden
- Dark Seer
- Dark Willow
- Dawnbreaker
- Dazzle
- Death Prophet
- Disruptor
- Doom
- Dragon Knight
- Drow Ranger
- Earth Spirit
- Earthshaker
- Elder Titan
- Ember Spirit
- Enchantress
- Enigma
- Faceless Void
- Grimstroke
- Gyrocopter
- Hoodwink
- Huskar
- Invoker
- Io
- Jakiro
- Juggernaut
- Keeper of the Light
- Kunkka
- Legion Commander
- Leshrac
- Lich
- Lifestealer
- Lina
- Lion
- Lone Druid
- Luna
- Lycan
- Magnus
- Marci
- Mars
- Medusa
- Meepo
- Mirana
- Monkey King
- Morphling
- Muerta
- Naga Siren
- Nature's Prophet
- Necrophos
- Night Stalker
- Nyx Assassin
- Ogre Magi
- Omniknight
- Oracle
- Outworld Destroyer
- Pangolier
- Phantom Assassin
- Phantom Lancer
- Phoenix
- Primal Beast
- Puck
- Pudge
- Pugna
- Queen of Pain
- Razor
- Riki
- Rubick
- Sand King
- Shadow Demon
- Shadow Fiend
- Shadow Shaman
- Silencer
- Skywrath Mage
- Slardar
- Slark
- Snapfire
- Sniper
- Spectre
- Spirit Breaker
- Storm Spirit
- Sven
- Techies
- Templar Assassin
- Terrorblade
- Tidehunter
- Timbersaw
- Tinker
- Tiny
- Treant Protector
- Troll Warlord
- Tusk
- Underlord
- Undying
- Ursa
- Vengeful Spirit
- Venomancer
- Viper
- Visage
- Void Spirit
- Warlock
- Weaver
- Windranger
- Winter Wyvern
- Witch Doctor
- Wraith King
- Zeus
This disambiguation page lists articles with a similar title or acronym.
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