The following NPCs can be found in Icecrown.

Questgivers

Alliance

•  Absalan the Pious
  •  [78] Judgment Day Comes!
  •  [80] Slaves to Saronite (Daily)
•  Captain Kendall
  •  [77] Securing the Perimeter
  •  [78] Set it Off!
•  Chief Engineer Boltwrench
  •  [80] Borrowed Technology
  •  [80] Get to Ymirheim!
  •  [80] Killohertz
  •  [80] Retest Now
  •  [80] Retest Now (Daily)
  •  [80] The Solution Solution (Daily)
•  Frazzle Geargrinder <Engineering Supplies>
  •  [80] King of the Mountain (PvP, Daily)
•  Ground Commander Koup
  •  [80] Assault by Air (Daily)
•  High Captain Justin Bartlett
  •  [80] ...All the Help We Can Get.
  •  [80] Get the Message
  •  [80] Capture More Dispatches (Daily)
  •  [80] The Broken Front
  •  [80] No Mercy! (Pvp, Daily)
  •  [80] Your Attention, Please
•  Kibli Killohertz
  •  [80] Leading the Charge
  •  [80] Static Shock Troops: the Bombardment (Daily)
  •  [80] Watts My Target
  •  [80] Putting the Hertz: The Valley of Lost Hope (Daily)
•  Knight-Captain Drosche
  •  [80] Joining the Assault
  •  [80] Blood of the Chosen (Daily)
•  Marshal Ivalius
  •  [79] The Skybreaker
•  Skybreaker Squad Leader
  •  [80] Assault by Ground (Daily)
•  Thassarian
  •  [80] Exploiting an Opening
  •  [80] Field Repairs
  •  [80] It's All Fun and Games
  •  [80] Not a Bug
  •  [80] Not a Bug (Daily)
  •  [80] Poke and Prod
  •  [80] That's Abominable!
  •  [80] That's Abominable! (Daily)
  •  [80] Against the Giants (Group)
  •  [80] Basic Chemistry (Group)
  •  [80] Coprous the Defiled (Group)
  •  [80] Neutralizing the Plague (Group, Daily)
  •  [80] Cannot Reproduce
  •  [80] Chain of Command
  •  [80] Sindragosa's Fall
  •  [80] Drag and Drop
  •  [80] Drag and Drop (Daily)
  •  [80] Need More Info (Group)
  •  [80] The Shadow Vault
  •  [80] Raise the Barricades
  •  [80] No Rest For The Wicked (Group)
  •  [80] No Rest For The Wicked (Group, Daily)
  •  [80] Bloodspattered Banners
  •  [80] The Ironwall Rampart (Group)
  •  [80] Before the Gate of Horror (Group)
  •  [80] The Guardians of Corp'rethar (Group)
  •  [80] Shatter the Shards (Group)
  •  [80] Sneak Preview
  •  [80] Tirion's Help

Horde

•  Blast Thunderbomb <Engineering Supplies>
  •  [80] King of the Mountain (PvP, Daily)
•  Brother Keltan
  •  [78] Judgment Day Comes!
  •  [80] Slaves to Saronite (Daily)
•  Chief Engineer Copperclaw
  •  [80] Green Technology
  •  [80] Get to Ymirheim!
  •  [80] Retest Now
  •  [80] Retest Now (Daily)
  •  [80] Volatility
  •  [80] Volatility (Daily)
•  Dying Berserker
  •  [80] Avenge Me!
•  Fringe Engineer Tezzla
  •  [80] Amped for Revolt!
  •  [80] Total Ohmage: The Valley of Lost Hope!
  •  [80] Fringe Science Benefits
  •  [80] Riding the Wavelength: The Bombardment (Daily)
•  Ground Commander Xutjja
  •  [80] Assault by Air (Daily)
•  Koltira Deathweaver
  •  [80] Opportunity
  •  [80] Field Repairs
  •  [80] It's All Fun and Games
  •  [80] Not a Bug
  •  [80] Not a Bug (Daily)
  •  [80] Poke and Prod
  •  [80] That's Abominable!
  •  [80] That's Abominable! (Daily)
  •  [80] Against the Giants (Group)
  •  [80] Basic Chemistry (Group)
  •  [80] Coprous the Defiled (Group)
  •  [80] Neutralizing the Plague (Group, Daily)
  •  [80] Cannot Reproduce
  •  [80] Chain of Command
  •  [80] Cradle of the Frostbrood
  •  [80] Drag and Drop
  •  [80] Drag and Drop (Daily)
  •  [80] Need More Info (Group)
  •  [80] The Shadow Vault
  •  [80] Raise the Barricades
  •  [80] No Rest For The Wicked (Group)
  •  [80] No Rest For The Wicked (Group, Daily)
  •  [80] Bloodspattered Banners
  •  [80] The Ironwall Rampart (Group)
  •  [80] Before the Gate of Horror (Group)
  •  [80] The Guardians of Corp'rethar (Group)
  •  [80] Shatter the Shards (Group)
  •  [80] Sneak Preview
  •  [80] Argent Aid
•  Kor'kron Squad Leader
  •  [80] Assault by Ground (Daily)
•  Sergeant Kregga
  •  [80] Establishing Superiority
  •  [80] Blow it Up!
•  Sky-Reaver Korm Blackscar
  •  [80] The Broken Front
  •  [80] Takes One to Know One
  •  [80] Blinding the Eyes in the Sky
  •  [80] Keeping the Alliance Blind (Daily)
  •  [80] Good For Something?
  •  [80] Make Them Pay! (PvP, Daily)
•  Warbringer Davos Rioht
  •  [80] Joining the Assault
  •  [80] Blood of the Chosen (Daily)
•  Warlord Hork Strongbrow
  •  [79] Orgrim's Hammer

Neutral

•  Aurochs Grimbane
  •  [80] Intelligence Gathering (Daily)
•  Baron Sliver
  •  [80] I Have an Idea, But First...
  •  [80] Free Your Mind
  •  [80] If He Cannot Be Turned...
  •  [80] If He Cannot Be Turned...
  •  [80] The Duke
  •  [80] Leave Our Mark (Daily)
  •  [80] Blackwatch
  •  [80] To the Rise with all Due Haste!
  •  [80] Vaelen Has Returned
•  Bethod Feigr
  •  [80] Revenge for the Vargul
•  Crusade Architect Silas
  •  [79] The Stone That Started A Revolution
•  Crusade Commander Entari
  •  [78] Scourge Tactics
  •  [78] If There Are Survivors...
•  Crusade Engineer Spitzpatrick
  •  [79] It Could Kill Us All
•  Crusader Bridenbrad
  •  [80] A Hero Remains
  •  [80] Time Yet Remains
  •  [80] Hope Yet Remains
•  Crusader Lord Dalfors
  •  [78] Defending The Vanguard
•  Crusader Olakin Sainrith
  •  [80] By Fire Be Purged
  •  [80] I'm Smelting... Smelting!
  •  [80] The Runesmiths of Malykriss
•  Darkrider Arly
  •  [80] Where Are They Coming From?
  •  [80] Death's Gaze
  •  [80] Destroying the Altars
  •  [80] Spill Their Blood
  •  [80] A Visit to the Doctor
  •  [80] Killing Two Scourge With One Skeleton
  •  [80] He's Gone to Pieces
  •  [80] Putting Olakin Back Together Again
  •  [80] The Flesh Giant Champion
•  Darkspeaker R'khem
  •  [80] Mind Tricks (Group)
•  Duke Lankral
  •  [80] Honor Challenge
  •  [80] Shadow Vault Decree
  •  [80] Vandalizing Jotunheim
•  Father Gustav
  •  [78] Curing The Incurable
  •  [78] The Restless Dead
  •  [78] Into The Frozen Heart Of Northrend
  •  [78] The Crusaders' Pinnacle
•  Father Kamaros
  •  [80] I'm Not Dead Yet!
  •  [80] I'm Not Dead Yet!
•  Geirrvif
  •  [80] Battle at Valhalas: Fallen Heroes (Group)
  •  [80] Battle at Valhalas: Khit'rix the Dark Master (Group)
  •  [80] Battle at Valhalas: The Return of Sigrid Iceborn (Group)
  •  [80] Battle at Valhalas: Carnage! (Group)
  •  [80] Battle at Valhalas: Thane Deathblow (Group)
  •  [80] Battle at Valhalas: Final Challenge (Group)
•  Highlord Tirion Fordring
  •  [78] Honor Above All Else
  •  [78] A Cold Front Approaches
  •  [78] Once More Unto The Breach, Hero
  •  [78] The Battle For Crusaders' Pinnacle
  •  [80] A Tale of Valor
  •  [80] The Keeper's Favor
  •  [80] The Touch of an Aspect
  •  [80] The Will of the Naaru
  •  [80] Tirion's Gambit
  •  [80] Tirion's Gambit
•  Keritose Bloodblade
  •  [80] Parting Gifts
  •  [80] An Undead's Best Friend
  •  [80] From Whence They Came
  •  [80] Honor is for the Weak
  •  [80] Seeds of Chaos
  •  [80] Amidst the Confusion
  •  [80] Vereth the Cunning
•  Lord-Commander Arete
  •  [80] The Story Thus Far...
  •  [80] Blood in the Water
  •  [80] You'll Need a Gryphon
  •  [80] In Strict Confidence
  •  [80] Second Chances (Group)
  •  [80] The Admiral Revealed (Group)
•  Matthias Lehner
  •  [80] Time to Hide
  •  [80] Return to the Surface
  •  [80] Return to the Surface
  •  [80] Do Your Worst
  •  [80] Army of the Damned
  •  [80] Futility
  •  [80] Futility
  •  [80] Where Dragons Fell
  •  [80] Time for Answers
  •  [80] The Hunter and the Prince
  •  [80] Knowledge is a Terrible Burden
  •  [80] Knowledge is a Terrible Burden
•  Penumbrius
  •  [78] Into The Wild Green Yonder
•  Setaal Darkmender
  •  [80] From Their Corpses, Rise! (Daily)
•  Siegemaster Fezzik
  •  [78] The Last Line Of Defense
•  The Bone Witch
  •  [80] Deep in the Bowels of The Underhalls
  •  [80] Reading the Bones
  •  [80] The Art of Being a Water Terror
  •  [80] Through the Eye
  •  [80] Find the Ancient Hero
  •  [80] Not-So-Honorable Combat
  •  [80] Banshee's Revenge
  •  [80] Battle at Valhalas
•  The Ebon Watcher
  •  [78] The Purging Of Scourgeholme
  •  [78] The Scourgestone
  •  [79] The Air Stands Still
•  The Leaper
  •  [80] Shoot 'Em Up (Daily)
  •  [80] Eliminate the Competition
  •  [80] The Bone Witch
•  Uzo Deathcaller
  •  [80] No Fly Zone (Daily)
•  Vaelen the Flayed
  •  [80] Get the Key
  •  [80] Let the Baron Know
  •  [80] Ebon Blade Prisoners
•  Vereth the Cunning
  •  [80] New Recruit
  •  [80] The Vile Hold
  •  [80] Generosity Abounds
  •  [80] Matchmaker
  •  [80] Stunning View
  •  [80] The Rider of Blood (Group)
  •  [80] The Rider of Frost (Group)
  •  [80] The Rider of the Unholy (Group)
  •  [80] The Fate of Bloodbane (Group)
•  Vile
  •  [80] Crush Dem Vrykuls!
  •  [80] Vile Like Fire! (Daily)

Class Trainers

None

Profession (Tradeskill) Trainers

None

Merchants

Alliance

•  Chief Engineer Boltwrench (Reagents & Engineering Supplies)
•  Frazzle Geargrinder <Engineering Supplies>
•  Galley Chief Dolinger (Food & Drink)

Horde

•  Blast Thunderbomb <Engineering Supplies>
•  Chief Engineer Copperclaw (Reagents & Engineering Supplies)
•  Utamu (Food & Drink)

Neutral

•  Bileblow <Poisons>
•  Boltskull <General Goods>
•  Broxel Goldgrasp <Souvenirs>
•  Crusader Marisse <Ammunition>
•  Duchess Mynx <Ebon Blade Quartermaster>
•  Durik Bronzebomb <Engineering Supplies>
•  Halig Fireforge <Blacksmithing Supplies>
•  Initiate Claget <Blades>
•  Initiate Gahark <General Goods>
•  Initiate Roderick <Poisons & Reagents>
•  Mangled <Trade Goods>
•  Quartermaster Vaskess <Innkeeper & Supplies>
•  Runesmith Balehammer <Blacksmithing Supplies>
•  Sarhule the Risen <Reagents>
•  Shambles <Food & Drink>
•  Sister Colleen Tulley <Food & Drink>
•  Supply Officer Thalmers <Poisons, Reagents & Trade Supplies>
•  Veteran Crusader Aliocha Segard <Argent Crusade Quartermaster>

Various Services

Neutral

•  Aedan Moran <Flight Master>
•  Dreadwind <Flight Master>
•  Imhadria <Stable Master>
•  Initiate Brenners <Innkeeper>
•  Morlia Doomwing <Flight Master>
•  Penumbrius <Flight Master>
•  Quartermaster Vaskess <Innkeeper & Supplies>