Listed below are all of the monsters in this book, organized alphabetically by type.
Aberration: aboleth, choker, chuul, cloaker, dark naga, drider, ettercap, froghemoth, gibbering mouther, guardian naga, intellect devourer, mimic, neothelid, otyugh, roper, rust monster, spirit naga, will-o'-wisp
(Air): air elemental, air mephit, djinni, dust mephit, invisible stalker, green dragon, will-o'-wisp
Animal: ankylosaurus, aurochs, bat, bat swarm, bison, boar, brachiosaurus, cat, cheetah, constrictor snake, crocodile, deinonychus, dire ape, dire bat, dire bear, dire boar, dire crocodile, dire hyena, dire lion, dire rat, dire shark, dire tiger, dire wolf, dire wolverine, dog, dolphin, eagle, elasmosaurus, electric eel, elephant, giant frilled lizard, giant frog, giant moray eel, giant octopus, giant squid, goblin dog, gorilla, grizzly bear, hawk, horse, hyena, leopard, lion, lizard, mastodon, monitor lizard, monkey, octopus, orca, owl, poison frog, pony, pteranodon, rat, rat swarm, raven, rhinoceros, riding dog, roc, shark, squid, stegosaurus, tiger, toad, triceratops, tyrannosaurus, venomous snake, viper, weasel, wolf, wolverine, woolly rhinoceros
(Aquatic): aboleth, chuul, crab swarm, dire shark, dragon turtle, giant crab, giant leech, giant moray eel, giant octopus, giant squid, kraken, leech swarm, merfolk, octopus, sahuagin, sea hag, sea serpent, shark, shoggoth, skum, squid
(Cold): frost giant, ice golem, ice linnorm, ice mephit, silver dragon, white dragon, winter wolf, yeti
Construct: animated object, clay golem, flesh golem homunculus, ice golem, iron cobra, iron golem, stone golem, wood golem, retriever
Dragon: black dragon, blue dragon, brass dragon, bronze dragon, copper dragon, crag linnorm, dracolisk, dragon turtle, gold dragon, ice linnorm, green dragon, pseudodragon, red dragon, silver dragon, tarn linnorm, white dragon, wyvern
(Earth): blue dragon, copper dragon, earth elemental, earth mephit, gargoyle, salt mephit, shaitan, xorn
Fey: dryad, mite, nymph, pixie, satyr
(Fire): brass dragon, fire giant, gold dragon, phoenix, red dragon
(Giant): cloud giant, cyclops, ettin, frost giant, fire giant, hill giant, ogre, ogre mage, stone giant, storm giant, troll
(Goblinoid): bugbear, goblin, hobgoblin
Humanoid: boggard, bugbear, cloud giant, cyclops, dark creeper, dark stalker, derro, drow, drow noble, duergar, ettin, fire giant, frost giant, gnoll, goblin, hill giant, hobgoblin, kobold, lizardfolk, merfolk, ogre, orc, stone giant, storm giant, svirfneblin, tengu, troglodyte, troll, wererat, werewolf
(Incorporeal): ghost, greater shadow, shadow, spectre, wraith
Magical Beast: ankheg, basilisk, behir, bulette, chimera, cockatrice, darkmantle, giant eagle, girallon, gorgon, griffon, hydra, kraken, manticore, owlbear, pegasus, phase spider, phoenix, purple worm, remorhaz, sea serpent, shocker lizard, sphinx, stirge, tarrasque, unicorn, winter wolf, worg
Monstrous Humanoid: centaur, doppelganger, gargoyle, green hag, harpy, lamia, medusa, minotaur, morlock, sahuagin, sea hag, skum, yeti
Ooze: black pudding, gelatinous cube, gray ooze, ochre jelly, shoggoth
Outsider (air): air elemental, air mephit, djinni, dust mephit, invisible stalker
Outsider (chaotic): azatas, bebelith, demons
Outsider (cold): ice mephit
Outsider (elemental): air elemental, earth elemental, fire elemental, invisible stalker, water elemental
Outsider (evil): barghest, bebelith, cauchemar, demons, devils, hell hound, kyton, nessian warhound, night hag, nightmare, vargouille, xill, yeth hound
Outsider (earth): earth elemental, earth mephit, salt mephit, shaitan, xorn
Outsider (fire): efreeti, fire elemental, fire mephit, hell hound, magma mephit, nessian warhound, salamander, steam mephit
Outsider (good): angels, archons, azatas
Outsider (lawful): archons, barghest, devils, hell hound, kyton, nessian warhound
Outsider (native): aasimar, couatl, janni, half-celestial, half-fiend, ogre mage, rakshasa, tiefling
Outsider (water): marid, water elemental, ooze mephit, water mephit
Plant: assassin vine, basidirond, giant flytrap, shambling mound, treant, vegepygmy, violet fungus, yellow musk creeper
(Reptilian): kobold, lizardfolk, troglodyte
(Shapechanger): barghest, bralani azata, doppelganger, ghaele azata, mimic, ogre mage, rakshasa, wererat, werewolf
(Swarm): army ant swarm, crab swarm, centipede swarm, leech swarm, rat swarm, spider swarm, wasp swarm
Template: ghost, half-celestial, half-dragon, half-fiend, lich, lycanthrope, skeleton, skeletal champion, vampire, zombie
Undead: devourer, ghost, ghoul, greater shadow, lich, mohrg, mummy, shadow, skeletal champion, skeleton, spectre, vampire, wight, wraith, zombie
Vermin: army ant swarm, cave fisher, centipede swarm, crab swarm, fire beetle, giant ant, giant centipede, giant crab, giant leech, giant mantis, giant scorpion, giant slug, giant spider, giant stag beetle, giant wasp, leech swarm, spider swarm, wasp swarm
(Water): black dragon, bronze dragon, marid, ooze mephit, water elemental, water mephit