Greyhawk: Paladins, Thieves, Half-Elves, Storm Giants, Lammasu, Blink Dogs, Druids, Bugbears, Will O Wisps, Liches, Lizard Men, Dopplegangers, Beholders, Umber Hulks, Phase Spiders, Ogre Magi, Shadows, Harpies, Wererats, Displacer Beasts, Hell Hounds, Apprentice, Footpad, Robber, Burglar, Cutpurse, Sharper, Pilferer, Master Pilferer, Master Thief, Balrog, Giant (Sumatran) Rat, Giant Toad, Triton, Brass Dragon, Copper Dragon, Bronze Dragon, Silver Dragon, Rust Monster, Stirge, Giant Tick, Owl Bear, Carrion Crawler, Gelatinous (note spelling) Cube, Giant Slug, Homunculus, Stone Golem, Iron Golem,Japanese Ogre (pic only), The Great Stone Face Enigma of Greyhawk

, Platinum Dragon/ The Dragon King, Chromatic Dragon/ The Dragon Queen, Gold(en) Dragon, Flesh Golem, Carnivorous Apes
Strategic Review #1 Mind Flayer
#2 Ranger, Roper
#3 Monster Manual Issue
#4 Illusionist, Clay Golem
Blackmoor: (Tho technically not Greyhawk

) Monk, Assassin (as a class), Novice, Initiate, Disciple, Immaculate, Master, Grand Master, GM Dragons, GM North Wind, GM West Wind, GM South Wind, GM East Wind, GM Winter, GM Autumn, GM Summer, GM Spring, GM Flowers, Apprentice (Assassin), Killer, Murderer, Slayer, Cutthroat, Dacoit, Thug, Executioner, Senior Assassin, Expert Assassin, Chief Assassin, Prime Assassin, Guildmaster of Assassins, Giant Beaver, Giant Otter, Giant Wasp, Fire Lizard, Minotaur Lizard, Elasmosaurus, Mosasaurus, Plesiosaurus, Giant Shark, Whale, Giant Eel, Lamprey, Sea Horse, Port. M-O-W, Dolphin, Aquatic Elf, Pungi Ray, Manta Ray, Water Spider, Weed Eel, Sahuagin (Devil-Men of the Deep), Eye of the Deep( Floating Eyes), Ixitxachitl, Locathah, Morkoth or Morlock, Masher, Giant Stag Beetle, Rhinocerous Beetle, Bombardier Beetle, Fire Beetle, Boring Beetle, Poisonous Coral, Strangle Weed, Nymphs, Mottled Worms, Sea Hag, Kopoacinth, Koalinth, Lacedons, Killer Frogs, Frogmen
Eldritch Wizardry: Druid (as a class), Aspirant, Initiate of the 1st-9th Circle, Archdruid, The Great Druid, Demon Type I-IV, Succubi, Type V, Type VI (Balrog), Orcus, Demogorgon, Couatl, Ki-Rin, Shedu, Intellect Devourer, Mind Flayer, Su-Monster, Brain Moles, Cerebral Parasites, Thought Eaters, Catoblepas, Grey (note sp) Ooze, Demon Prince Nql......, Groaning Spirit, Leprechauns, True Giant, Other Were, Giant Frogs, Rakshasa, Wind Walkers, Shambling Mounds, Wild Dogs, Wild Pigs, Wild Horses, Wild Cattle, Giant Porcupines, Giant Skunks, Giant Lynx, Wolverines, Stags, Giant Owls, Mtn Lions, Giant Rams, Giant Goats, Baboons, Wild Asses, Wild Camels, Leopards, Flightless Birds, Hyenas, Elephants, Rhinos, Jaguars, Buffalo, Herd Animals, Fairies, Satyrs, Giant Leaches (note sp), Hippos, Giant Turtles, Giant Crayfish, Giant Crocs, Irish Deer, Giant Armadilloes, Giant Sloths, Giant Tortoises, Neanderthals
Gods, Demi-gods, & Heroes: Minions of Set, Sphinx, Fire Snake, Winged Serpent, Phoenix, Brahama's Goose, Kali, Yama's Buffalo, Peacock of Karttekeza, Krishna, Maruts, Rakshasas, Yakshas, Naga, Ribhus, White Eagle, Cyclopes One Eyed Giants, Satyrs, Cereberus, The Hundred Handed One, Math, Balor, Tanngjost & Tanngrisner, The Valkyrs, The Einheriar, (Rock Giants, Mimir, Sterkodder, Hymer, Vafthrunder, Skyrmir, Mokkerkalfe, Hrothjof, Hrungner, Orvandel, Gymer, Thjasse) the Giants, Garm, The Fenris Wolf, The Midgard Serpent, (Fafnir, Nidhug, Ofnir) the Dragons, (Modsogner, Durin) the Dwarves, Fjalar, Light Elves, Dark Elves, Nissies (brownies), Neck, Fossergrims, Sigurd, Andvari, Hreidmar, Odder, Fafner, Reign, Joukahainen, Ilmarinen, Ilmatar, Louhi, Water Hero, Sampsa Perlervoinen, Tounelea, Old Crone of Pohjola, Son of Pohja, Maiden of Pohja, Water Giant, Iku-turso, Syojatar, Anero Vipunen, Summon the Earth Queen, Black Snake, Giant Pike, Mothers, Conan, Thrgra Khotan, Thoth Amon, Khitan Assassins, The Black Seers, Epemstreus the Sage, Pictish Shaman, Priests of the Golden Peacock, Demon of the Black Hands, Mountain Apes, Brylukas, Thaug the Demon, Ollam-Onga, Kraken, Red Shadows, Dragon Lizard, Khosatral Khel the Demon, Ghouls of Yanaidar, Ice Worm, Vampire Gorgon of Akhlat, Octupus Demon, Vampire Vine, Yag-Kosha, Curse of Larsha, Elric, Moonglum, Yyrkoon, Theles Kaarna, Orunlu, Mordagz, Kakatal, Straaash, Grome, Misha, Meerclar, Haaashasstaak, Roofdrak, Muru-Ah, Lileet, Nnuuurrr'c'c, Elenoin, Grahluk, Pantang Warriors, Myyrrhm, Mist Giants, Dharzi Hunting Dogs, Clakars, Quaolnargn, Giant Owl. Oonai, Delmains, Nihrain Horses, Vulture Lions, Vampire Trees, Pyaray Blood Red Octopus, Water Women, Water Monster, Conch and Cane, Spirits of Air, Ma Yuan Shuai, Fairies, Evil Spirits
not a complete list....i left out repeats when i could remember

and i left out all of the gods, goddesses, and demi-gods.. as timothy(tim) j. kask said in the foreword to Supplement IV 4 July 1976....
Timothy J. Kask said:
...This is our last attempt to delineate the absurdity of 40+ level characters. When Odin, the All-Father has only (?) 300 hit points, who can take a 44th level Lord seriously?