Mordenkainen Presents Monsters of the Multiverse contains revamped stat blocks for 260 monsters previously published in previous Dungeons & Dragons 5E books. The list was compiled by YouTuber Bob Worldbuilder based on some blurry screenshots originally shared by Nerd Immersion (see the video below). I have transcribed it here for convenience.
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D&D 5E - List of All 33 Races in Mordenkainen's Monsters of the Multiverse
Mordenkainen Presents Monsters of the Multiverse contains 33 races compiled from previous Dungeons & Dragons books. Aarackocra Assimar Bugbear Centaur Changeling Deep Gnome Duergar Eladrin Fairy Firbolg Genasi, Air Genasi, Earth Genasi, Fire Gennasi, Water Githyanki Githzerai Goblin Goliath...
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- Abishai (Black, Blue, Green, Red, White)
- Alhoon
- Alkilith
- Allip
- Amnizu
- Annis Hag
- Archdruid
- Archer
- Armanite
- Astral Deadnought
- Babau
- Bael
- Balhannoth
- Banderhobb
- Baphomet
- Bard
- Barghest
- Berbalang
- Bheur Hag
- Blackguard
- Bodak
- Boggle
- Boneclaw
- Bulezau
- Cadaver Collector
- Canoloth
- Catoblepas
- Cattle (Aurochs, Ox, Stench Kow, Deep Rothe)
- Cave Fisher
- Champion
- Chitine
- Choker
- Choldrith
- Clockwork (Bronze Scout, Iron Cobra, Oaken Bolter, Stone Defender)
- Cloud Giant Smiling One
- Corpse Flower
- Cranium Rat, Swarm of Cranium Rat
- Darkling, Darkling Elder
- Death Kiss
- Deathlock, Deathlock Mastermind, Deathlock Wight
- Deep Scion
- Demogorgon
- Derro, Derro Savant
- Devourer
- Dhergoloth
- Dinosaurs (Brontosaurus, Deinonychus, Dimetrodon, Hadrosaurus, Quetzalcoatlus, Stegosaurus, Velociraptor)
- Dolphin, Dolphin Delighter
- Draegloth
- Drow (Arachnomancer, Favored Consort, House Captain, Inquisitor, Matron Mother, Shadowblade)
- Duergar (Despot, Kavalrachni, Mind Master, Soulblade, Stone Guard, Warlord, Xarrorn, Hammerer, Screamer)
- Dybbuk
- Eidolon
- Eladrin (Autumn, Spring, Summer, Winter)
- Elder Brain
- Elder Tempest
- Elemental Myrmidon (Air, Earth, Fire, Water)
- Fire Giant Dreadnought
- Firenewt (Warrior, Warlock of Imix)
- Flail Snail
- Flind
- Fraz-Urb'luu
- Froghemoth
- Frost Giant Everlasting One
- Frost Salamander
- Gauth
- Gazer
- Geryon
- Giant Strider
- Giff
- Girallon
- Githyanki (Gish, Kith'rak, Supreme Commander, Anarch, Enlightened)
- Gnoll (Flesh Gnawer, Hunter, Witherling)
- Gray Render
- Grazz't
- Grung (Elite Warrior, Wildling)
- Guard Drake
- Hellfire Engine
- Hobgoblin (Devastator, Iron Shadow)
- Howler
- Hutijin
- Hydroloth
- Juiblex
- Ki-Rin
- Kobold (Dragonshield, Inventor, Scale Sorcerer)
- Korred
- Kraken Priest
- Kruthik (Hive Lord, Adult, Young)
- Leucrotta
- Leviathan
- Martial Arts Adept
- Marut
- Master Thief
- Maurezhi
- Maw Demon
- Meazel
- Meenlock
- Merregon
- Merrenoloth
- Mindwitness
- Moloch
- Molydeus
- Morkoth
- Mouth of Grolantor
- Nabassu
- Nagpa
- Narzugon
- Neogi, Neogi Hatchling, Neogi Master
- Neothelid
- Nightwalker
- Nilbog
- Nupperibo
- Oblex (Spawn, Adult, Elder)
- Ogre (Battering Ram, Bolt Launcher, Chain Brute, Howdah)
- Oinoloth
- Orcus
- Orthon
- Phoenix
- Quickling
- Redcap
- Retriever
- Rutterkin
- Sea Spawn
- Shadar Kai (Gloom Weaver, Shadow Dancer, Soul Monger)
- Shadow Mastiff, Shadow Mastiff Alpha
- Shoosuva
- Sibriex
- Skulk
- Skull Lord
- Slithering Tracker
- Shadowsworn (The Angry, The Hungry, The Lonely, The Lost, The Wretched)
- Spawn of Kyuss
- Star Spawn (Grue, Hulk, Lava Mage, Mangler, Seer)
- Steeder (Female, Male)
- Steel Predator
- Stone Cursed
- Stone Giant Dreamwalker
- Storm Giant Quintessent
- Swarm of Rot Grubs
- Swachbuckler
- Sword Wraith (Commander, Warrior)
- Tanarukk
- Titivilus
- Tlincalli
- Tortle
- Turtle Druid
- Trapper
- Troll (Dire, Rot, Spirit, Venom)
- Ulitharid
- Vampiric Mist
- Vargouille
- Vegepygmy, Vegepygmy Chief, Vegepygmy Thorny
- War Priest
- Warlock (of the Archfey, Fiend, Great Old One)
- Warlord
- Wastrilith
- Wizard (Apprentice, Abjurer, Conjurer, Diviner, Enchanter, Evoker, Illusionist, Necromancer, Transmuter)
- Wood Woad
- Xvart, Xvart Warlock of Raxivort
- Yagnoloth
- Yeenoghu
- Yeah Hound
- Yuan-ti (Anathema, Broodguard, Mind Whisperer, Nightmare Speaker, Pit Master)
- Zaratan
- Zariel
- Zuggtmoy
