Death knight sets refer to a collection of equipment with a death knight class restriction that provides an additional bonus when worn together. Death knights have fewer equipment sets than most classes, but still have many to choose from.
Tier sets [ ]
Tier 7 (10-man), Heroes' Scourgeborne Battlegear , Plate
Tier 7 (25-man), Valorous Scourgeborne Battlegear , Plate
Tier 8 (10-man), Valorous Darkruned Battlegear , Plate
Tier 8 (25-man), Conqueror's Darkruned Battlegear , Plate
Tier 9 (10-man), Conqueror's Thassarian's Battlegear , Plate
Tier 9 (25-man), Triumphant Thassarian's Battlegear , Plate
Tier 9 (10-man), Conqueror's Koltira's Battlegear , Plate
Tier 9 (25-man), Triumphant Koltira's Battlegear , Plate
Tier 10 (10-man), Scourgelord's Battlegear , Plate
Tier 10 (25-man), Sanctified Scourgelord's Battlegear , Plate
Tier 11 , Magma Plated Battlegear , Battlearmor
Tier 12 , Elementium Deathplate Battlegear , Battlearmor
Tier 13 , Necrotic Boneplate Battlegear , Armor
Tier 14 , Battlegear of the Lost Catacomb , Plate
Tier 15 , Battleplate of the All-Consuming Maw , Plate
Tier 16 , Battleplate of Cyclopean Dread , Plate
Tier 17 , Ogreskull Boneplate Battlegear
Tier 18 , Demongaze Armor
Tier 19 , Dreadwyrm Battleplate
Tier 20 , Gravewarden Armaments
Tier 21 , Dreadwake Armor
Tier 22 , First Eidolon's Soulsteel
PvP sets [ ]
Season 5 , Savage Gladiator's Desecration
Season 5 , Hateful Gladiator's Desecration
Season 5 , Deadly Gladiator's Desecration
Season 6 , Furious Gladiator's Desecration
Season 7 , Relentless Gladiator's Desecration
Season 8 , Wrathful Gladiator's Desecration
Season 9 , Bloodthirsty Gladiator's Desecration
Season 9 , Vicious Gladiator's Desecration
Season 10 , Ruthless Gladiator's Desecration
Season 11 , Cataclysmic Gladiator's Desecration
Season 12 , Dreadful Gladiator's Desecration
Season 12 , Malevolent Gladiator's Desecration
Season 13 , Tyrannical Gladiator's Desecration
Season 14 , Grievous Gladiator's Desecration
Season 15 , Prideful Gladiator's Desecration
Warlords Season 1 , Primal Combatant's Desecration / Primal Gladiator's Desecration
Warlords Season 2 , Wild Combatant's Desecration / Wild Gladiator's Desecration
Warlords Season 3 , Warmongering Combatant's Desecration / Warmongering Gladiator's Desecration
Legion Season 1 / 2 , Vindictive Gladiator's Dreadplate Armor
Legion Season 3 / 4 , Cruel Gladiator's Dreadplate Armor
Legion Season 5 / 6 / 7 , Fierce Gladiator's Dreadplate Armor
Battle for Azeroth Season 1 / Arathi Warfront , Dread Gladiator's Plate
Battle for Azeroth Season 2 / Darkshore Warfront , Wardenguard's Battleplate , Sinister Gladiator's Plate Armor
Battle for Azeroth Season 3 , Notorious Gladiator's Plate Armor
Battle for Azeroth Season 4 , Corrupted Gladiator's Plate Armor
Shadowlands Season 1 , Sinful Gladiator's Plate Armor / [ Sinful Aspirant's Plate Armor]
Shadowlands Season 2 , Unchained Gladiator's Plate Armor / [ Unchained Aspirant's Plate Armor]
Shadowlands Season 3 , Cosmic Gladiator's Dreadplate Armor / Cosmic Aspirant's Plate
Shadowlands Season 4 , Eternal Gladiator's Plate Armor / [ Eternal Aspirant's Plate Armor]
Death knight sets
Raid sets
Tier 22: First Eidolon's Soulsteel