The following NPCs can be found in Shattrath City.
Questgivers
Alliance
Alliance Brigadier General
[70] Call to Arms: Warsong Gulch (Alliance) (PvP, Daily)
[70] Call to Arms: Arathi Basin (Alliance) (PvP, Daily)
[70] Call to Arms: Alterac Valley (Alliance) (PvP, Daily)
[70] Call to Arms: Eye of the Storm (Alliance) (PvP, Daily)
Draenei Orphan (Children's Week)
Horde
Blood Elf Orphan (Children's Week)
Horde Warbringer
[70] Call to Arms: Warsong Gulch (Horde) (PvP, Daily)
[70] Call to Arms: Arathi Basin (Horde) (PvP, Daily)
[70] Call to Arms: Alterac Valley (Horde) (PvP, Daily)
[70] Call to Arms: Eye of the Storm (Horde) (PvP, Daily)
Neutral
"Dirty" Larry <Ruffian>
A'dal
[68+] Auchindoun... (Dungeon)
[70+] How to Break Into the Arcatraz (Dungeon)
[70+] Harbinger of Doom (Dungeon)
[70+] Trial of the Naaru: Mercy (Heroic)
[70+] Trial of the Naaru: Strength (Heroic)
[70+] Trial of the Naaru: Tenacity (Heroic)
[70] Revered Among the Sha'tar
Adyen the Lightwarden
[65] Marks of Kil'jaeden
[65] Single Mark of Kil'jaeden (Repeatable)
[65] More Marks of Kil'jaeden (Repeatable)
[70] Marks of Sargeras
[70] Single Mark of Sargeras (Repeatable)
[70] More Marks of Sargeras (Repeatable)
Andrion Darkspinner <Shadoweave Specialist>
[70] Becoming a Shadoweave Tailor (Tailoring)
Apprentice Tasserel
[70] Archmage Alturus
Arcanist Adyria
[65] Voren'thal's Visions
[65] More Basilisk Eyes (Repeatable)
Arcanist Savan
Dathris Sunstriker
[70] Duty Calls
Defender Grashna
[65+] The Skettis Offensive (Group)
Emissary Mordin
[70 Daily] Gaining the Advantage
Exarch Nasuun
[70 Daily] Intercepting the Mana Cells
Ezekiel
[67+] What Book? I Don't See Any Book. (Group)
Fantei <Reagents>
General Tiras'alan
Griftah
[70] Oooh, Shinies!
Haggard War Veteran
[65] A'dal
Ishanah <High Priestess of the Aldor>
[64] Restoring the Light
[70] A Cleansing Light
[70] Fel Armaments (Repeatable)
[70+] Deathblow to the Legion (Group)
Jorus
Khadgar <Sons of Lothar>
[65] City of Light
[65] Allegiance to the Aldor
[65] Allegiance to the Scryers
[65] Ishanah
[65] Voren'thal the Seer
[70+] Entry Into Karazhan (Dungeon)
[70+] The Second and Third Fragments (Dungeon)
[70+] The Master's Touch (Dungeon)
[70] The Violet Eye
[70] The Tempest Key
Lord Torvos
[70 Daily] Sunfury Attack Plans
Magister Falris
[65] Losing Gracefully
Magistrix Fyalenn <The Scryers>
[65] Firewing Signets
[65] Single Firewing Signet (Repeatable)
[65] More Firewing Signets (Repeatable)
[70] Sunfury Signets
[70] Single Sunfury Signet (Repeatable)
[70] More Sunfury Signets (Repeatable)
Malfas
Nasmara Moonsong <Mooncloth Specialist>
[70] Becoming a Mooncloth Tailor (Tailoring)
Nutral <Flight Master>
Oloraak <Fish Merchant>
[69] Can't Stay Away
Onyxien
Orphan Matron Mercy
[70] Children's Week (Children's Week)
Rilak the Redeemed
[62] The Eyes of Skettis
[63] Seek Out Kirrik
[70] Countdown to Doom
Sal'salabim
[68+] Crackin' Some Skulls (Group)
[68+] It's Just That Easy? (Group)
Seth
[64] Rather Be Fishin'
Sha'nir <The Aldor>
[64] Strained Supplies
[64+] A Cure for Zahlia (Group)
Spymistress Mehlisah Highcrown
Suraku
The Rokk <Master of Cooking>
[??] Soup for the Soul
Tobias the Filth Gorger
V'eru
[70] Speak with the Ogre
Vekax
[65] The Outcast's Plight
[65] More Feathers (Repeatable)
Voranaku
Voren'thal the Seer
[70] Synthesis of Power
[70] Arcane Tomes (Repeatable)
[70+] Turning Point (Group)
Wind Trader Lathrai
[64] A Personal Favor
[64] Investigate Tuurem
Yuula <Recruitment Officer>
[70] Threat from Above
[70] To Skettis!
Zoya
Class Trainers
Neutral
Iorioa <Portal Trainer>
Mi'irku Farstep <Portal Trainer>
Profession (Tradeskill) Trainers
Neutral
Darmari <Master Leatherworking Trainer>
Enchantress Volali <Enchanting Trainer>
High Enchanter Bardolan <Master Enchanting Trainer>
Hamanar <Master Jewelcrafting Trainer>
Kradu Grimblade <Weaponsmith Trainer>
Zula Slagfury <Armorsmith Trainer>
Kylene <Barmaid> (Specialty Cooking Trainer)
Jack Trapper <Cook>
Lorokeem <Master Alchemy Trainer>
Mildred Fletcher <Physician>
Seymour <Master Skinning Trainer>
Merchants
Neutral
Aaron Hollman <Blacksmithing Supplies>
Ahemen <Staff Vendor>
Almaador <Sha'tari Quartermaster>
Amshesha Stilldark <Reagent Vendor>
Andrion Darkspinner <Shadoweave Specialist>
Anwehu <Weapons & Armorsmith>
Arodis Sunblade <Keeper of Sha'tari Artifacts>
Arcanist Xorith <Scryer Apothecary>
Asuur <Keeper of Sha'tari Artifacts>
Brendan Turner <Meat Vendor>
Cro Threadstrong <Leatherworking Supplies>
Eiin <Specialty Tailoring Supplies>
Eral <General Goods>
Ernie Packwell <Trade Goods>
Fantei <Reagent Vendor>
G'eras (Badge Rewards Vendor)
Garul <Food and Drink Vendor>
Gidge Spellweaver <Spellfire Specialist>
Granny Smith <Fruit Seller>
Griftah <Amazing Amulets>
Inessera <Jewelcrafting Supplies Vendor>
Innkeeper Haelthol <Innkeeper>
Inscriber Saalyn <Aldor Inscriptions>
Inscriber Veredis <Scryer Inscriptions>
Jim Saltit <Cooking Supplier>
Karokka <Poison Supplies>
Kelara <Keeper of Sha'tari Heirlooms>
Kylene <Barmaid>
Lisrythe Bloodwatch <Fence>
Lissaf <Blade Merchant>
Madame Ruby <Enchanting Supplies>
Mahir Redstroke <Dagger Vendor>
Muffin Man Moser <Bread Merchant>
Nakodu <Lower City Quartermaster>
Nalama the Merchant <General Goods>
Nasmara Moonsong <Mooncloth Specialist>
Oloraak <Fish Merchant>
Ontuvo <Jewelcrafting Supplies>
Quartermaster Endarin <Aldor: Quartermaster>
Quartermaster Enuril <Scryers: Quartermaster>
Quelama Lightblade <Wand Vendor>
Selanam the Blade <Sword Vendor>
Shaarubo <Bartender>
Skreah <Alchemy Supplies>
Trader Endernor <Trade Goods>
Urumir Stavebright <Staff Vendor>
Veynna Dawnstar <Keeper of Sha'tari Heirlooms>
Viggz Shinesparked <Engineering Supplies>
Vinemaster Alamaro <Wine Vendor>
Wind Trader Lathrai <Engineering Supplies>
Yurial Soulwater <Enchanting Supplies>
Various Services
Alliance
Adam Eternum <Arathi Basin Battlemaster>
Eye of the Storm Emissary - (Eye of the Storm Recruiter) (Call to Arms: Eye of the Storm)
Haelga Slatefist <Alterac Valley Battlemaster>
Iravar <Eye of the Storm Battlemaster>
League of Arathor Emissary - (Arathi Basin Recruiter) (Call to Arms: Arathi Basin)
Lylandor <Warsong Gulch Battlemaster>
Silverwing Emissary - (Warsong Gulch Recruiter) (Call to Arms: Warsong Gulch)
Stormpike Emissary - (Alterac Valley Recruiter) (Call to Arms: Alterac Valley)
Horde
Defilers Emissary (Arathi Basin Recruiter) (Call to Arms: Arathi Basin)
Eye of the Storm Envoy - (Eye of the Storm Recruiter) (Call to Arms: Eye of the Storm)
Frostwolf Emissary (Alterac Valley Recruiter) (Call to Arms: Alterac Valley)
Keldor the Lost <Arathi Basin Battlemaster>
Montok Redhands <Warsong Gulch Battlemaster>
Warsong Emissary (Warsong Gulch Recruiter) (Call to Arms: Warsong Gulch)
Wolf-Sister Maka <Alterac Valley Battlemaster>
Yula the Fair <Eye of the Storm Battlemaster>
Neutral
Aldor Vindicator (Directions)
"Backstab" Bindo Gearbomb <Arena Battlemaster>
Berudan Keysworn <Banker>
Caylee Dak
Gromden <Banker>
Ilthuril <Stable Master>
Innkeeper Haelthol <Innkeeper>
L'lura Goldspun <Banker>
Mendorn <Banker>
Minalei <Innkeeper>
Nutral <Flight Master>
Oruhe <Stable Master>
Scryer Arcane Guardian (Directions)
Shattrath City Peacekeeper (Directions)