Swamp Monsters
265 D&D 5e monsters that dwell in swamp habitats — sorted by challenge rating so you can pick the right encounter for your tier.
Adult Oblex CR 5 · OozeAdult Black Dragon CR 14 · Dragon (Chromatic)Alligator CR 1/4 · BeastAlligator Turtle CR 1/4 · BeastBog Body CR 1 · UndeadBoloti CR 1 · FeyBlack Guard Drake CR 2 · DragonBlue Guard Drake CR 2 · DragonBagiennik CR 3 · AberrationAngulotl Needler CR 4 · HumanoidAstralsupial CR 4 · BeastBrachyura Shambler CR 4 · MonstrosityBullywug Bog Sage CR 4 · FeyBullywug Bog Sage* CR 4 · FeyAllip CR 5 · UndeadAmphibolt CR 5 · MonstrosityBefouled Weird CR 5 · ElementalAngulotl Seer CR 6 · HumanoidAngulotl Slink CR 6 · HumanoidAncient Black Dragon CR 21 · Dragon (Chromatic)Angulotl Blade CR 1/4 · HumanoidAngulotl Tadpole CR 1/4 · HumanoidAngulotl Yegg CR Variable · BeastArchaeopteryx CR 1/4 · Beast (Dinosaur)Black Patch CR 6 · OozeBodak CR 6 · UndeadBerberoka CR 7 · GiantBukavac CR 9 · MonstrosityBelu CR 10 · GiantArchdruid CR 12 · HumanoidAttercroppe CR 1/2 · FeyBullywug CR 1/4 · HumanoidBullywug Warrior CR 1/4 · FeyBullywug Warrior* CR 1/4 · FeyCapybear CR 1 · MonstrosityCarrier Mosquito CR 3 · BeastCatoblepas CR 5 · MonstrosityClawfish CR 1/8 · BeastClawfish Companion CR Variable · BeastClockwork Leech CR 1 · ConstructConniption Bug CR 1 · BeastConstrictor Snake CR 1/4 · BeastDarkling CR 1 · FeyDimetrodon CR 1 · Beast (Dinosaur)Ghoul CR 1 · UndeadDarkling Elder CR 2 · FeyEmpowered Bog Body CR 3 · UndeadFlail Snail CR 3 · ElementalFaux-Garou CR 5 · ConstructCorpse Flower CR 8 · PlantCrocodile CR 1/2 · BeastDawnfly Desolation Nymph CR 2 · BeastEgret Harpy CR 2 · MonstrosityGhast CR 2 · UndeadDeath Vulture CR 4 · MonstrosityEleinomae CR 5 · FeyFleshdreg CR 5 · PlantGhast Gravecaller CR 6 · UndeadGhast Gravecaller* CR 6 · UndeadFoxfire Ooze CR 10 · OozeFroghemoth CR 10 · MonstrosityCulicoid CR 12 · Fiend (Demon)Dawnfly CR 19 · BeastDipsa CR 1/4 · OozeDiseased Giant Rat CR 1/8 · BeastElder Oblex CR 10 · OozeEquitox CR 13 · FiendExploding Toad CR 1/4 · MonstrosityGiant Constrictor Snake CR 2 · BeastGiant Crocodile CR 5 · BeastGiant Frog CR 1/4 · BeastGiant Leech CR 1/4 · BeastGiant Lizard CR 1/4 · BeastGiant Poisonous Snake CR 1/4 · BeastGiant Rat CR 1/8 · BeastGiant Spider CR 1 · BeastGiant Toad CR 1 · BeastGiant Venomous Snake CR 1/4 · BeastGlass Gator CR 1 · BeastHadrosaurus CR 1 · Beast (Dinosaur)Green Guard Drake CR 2 · DragonGuard Drake CR 2 · DragonHirudine Stalker CR 2 · MonstrosityKappa CR 2 · FeyGreen Hag CR 3 · FeyGiant Water Scorpion CR 4 · BeastGutter Troll CR 4 · GiantHippopotamus CR 4 · BeastGreen Hag (Coven Variant) CR 5 · FeyKongamato CR 5 · BeastGraveyard Revenant CR 7 · UndeadGraveyard Revenant* CR 7 · UndeadGreater Scrag CR 7 · MonstrosityHuecambra CR 8 · MonstrosityHydra CR 8 · MonstrosityKami, Hebi-Doku CR 8 · FeyKirikari CR 9 · MonstrosityHaunting Revenant CR 10 · UndeadHaunting Revenant* CR 10 · UndeadHorned Serpent CR 12 · MonstrosityJeholopterus CR 1/4 · Beast (Dinosaur)Kobold Warrior CR 1/8 · DragonLizardfolk CR Unknown · Lacedon Ghoul CR 1 · UndeadLacedon Ghoul* CR 1 · UndeadMeazel CR 1 · MonstrosityMoss Lurker CR 1 · HumanoidLeech Swarm CR 2 · Swarm of Tiny BeastsLesser Scrag CR 2 · MonstrosityLizardfolk Bloodeye CR 2 · HumanoidLizardfolk Bloodeye Slime Servant CR 2 · HumanoidLizardfolk Geomancer CR 2 · ElementalLizardfolk Geomancer* CR 2 · ElementalLizardfolk Shaman CR 2 · HumanoidLou Carcolh CR 2 · MonstrosityMeenlock CR 2 · FeyLazavik CR 3 · FeyMbielu CR 3 · Beast (Dinosaur)Mold Zombie CR 3 · UndeadLizardfolk Sovereign CR 4 · ElementalLizardfolk Sovereign* CR 4 · ElementalLizardfolk Terrorsaur CR 4 · HumanoidLobe Lemur CR 4 · MonstrosityLakescourge Lotus CR 5 · UndeadManggus CR 5 · GiantMortifera CR 6 · AberrationMarsh Hydra CR 7 · MonstrosityMaurezhi CR 7 · Fiend (Demon)Marsh Dire CR 8 · UndeadLeech Demon CR 11 · Fiend (Demon)Lizardfolk Grunt CR 1/2 · HumanoidLizardfolk Hunter CR None · HumanoidLizardfolk Scaletooth CR 1/2 · HumanoidLost Sorrowsworn CR 7 · MonstrosityMangrove Treant CR 7 · PlantMiremal CR 1/2 · FeyMud Mephit (Summoner Variant) CR 1/4 · ElementalRat CR 0 · BeastRaven CR 0 · BeastNodosaurus CR 1 · Beast (Dinosaur)Oblex Spawn CR 1 · OozeOgrillon Ogre CR 1 · GiantOgrillon Ogre* CR 1 · GiantOgre CR 2 · GiantOgre Goon CR 2 · GiantOrc Eye of Gruumsh CR 2 · HumanoidPutrid Haunt CR 2 · UndeadRazorfeather Raptor CR 2 · MonstrosityRed Guard Drake CR 2 · DragonPurple Slime CR 3 · OozeQuickserpent CR 4 · BeastRot Angel CR 4 · CelestialMudmutt CR 5 · MonstrosityOphidiotaur CR 5 · MonstrosityPeat Mummy CR 5 · UndeadRevenant CR 5 · UndeadRevenant* CR 5 · UndeadPrimal Oozer CR 6 · AberrationRedcap CR 6 · FeyMurgrik CR 9 · AberrationOozasis CR 9 · OozeRot Troll CR 9 · GiantPeat Mammoth CR 10 · PlantNabassu CR 15 · Fiend (Demon)Nagpa CR 17 · MonstrosityNightwalker CR 20 · UndeadOgre Basher CR None · GiantOtterfolk CR 1/4 · HumanoidPoisonous Snake CR 1/8 · BeastResinous Frog CR 1/4 · BeastSkulk CR 1 · MonstrositySporous Crab CR 1 · BeastSpurred Water Skate CR 1 · BeastStar Spawn Grue CR 1 · AberrationRotsam CR 2 · OozeScrofin CR 2 · FeyShadow Mastiff CR 2 · MonstrositySwampgas Bubble CR 2 · OozeSwampgas Shade CR 2 · UndeadShadow Mastiff Alpha CR 3 · MonstrositySerpopard CR 4 · BeastSacred Hippopotamus CR 5 · CelestialScarlet Ibis CR 5 · MonstrosityShambling Mound CR 5 · PlantShambling Pile CR 5 · PlantRotsam Swarm CR 6 · Swarm of Tiny OozesShabti CR 8 · ConstructSathaq Worm CR 10 · ElementalSedge Dragonette CR 1/2 · DragonShambling Mound Companion CR None · PlantSwamp Naga CR 6 · MonstrositySwamp Lily CR 7 · PlantSpirit Troll CR 11 · GiantSpinosaurus CR 13 · Beast (Dinosaur)Star Spawn Seer CR 13 · AberrationSkull Lord CR 15 · UndeadStirge CR 1/8 · BeastSuturefly CR 1/4 · BeastSwamp Adder CR 1/4 · BeastSwamp Dryad CR 13 · FeySwarm of Biting Gnats CR 1/4 · Swarm of Tiny BeastsSwarm of Insects CR 1/2 · Swarm of Tiny BeastsSwarm of Insects (Beetles) CR 1/2 · Swarm of Tiny BeastsSwarm of Insects (Centipedes) CR 1/2 · Swarm of Tiny BeastsSwarm of Insects (Spiders) CR 1/2 · Swarm of Tiny BeastsSwarm of Insects (Wasps) CR 1/2 · Swarm of Tiny BeastsSwarm of Poisonous Snakes CR 2 · Swarm of Tiny BeastsSwarm of Rats CR 1/4 · Swarm of Tiny BeastsSwarm of Ravens CR 1/4 · Swarm of Tiny BeastsSwarm of Rot Grubs CR 1 · Swarm of Tiny BeastsThorny Vegepygmy CR 1 · PlantVargouille CR 1 · FiendWirbeln Fungi CR 1 · PlantWretched Sorrowsworn CR 1 · MonstrosityYuan-ti Infiltrator CR 1 · MonstrosityYuan-ti Infiltrator* CR 1 · MonstrosityZanskaran Viper CR 1 · BeastSwarm of Stirges CR 2 · Swarm of Tiny MonstrositiesSwarm of Stirges* CR 2 · Swarm of Tiny MonstrositiesSwarm of Venomous Snakes CR 2 · Swarm of Tiny BeastsTroll Limbjumble CR 2 · GiantVegepygmy Chief CR 2 · PlantWereotter CR 2 · HumanoidWhite Guard Drake CR 2 · DragonWill-o'-Wisp CR 2 · UndeadSwarm of Swamp Slirghs CR 3 · Swarm of Tiny ElementalsVampiric Mist CR 3 · UndeadViiret CR 3 · PlantWight CR 3 · UndeadYuan-ti Malison (Type 1) CR 3 · MonstrosityYuan-ti Malison (Type 1)* CR 3 · MonstrosityYuan-ti Malison (Type 2)* CR 3 · MonstrosityYuan-ti Malison (Type 3)* CR 3 · MonstrosityYuanti Malison (Type 5) CR 3 · MonstrosityWarlock of the Archfey CR 4 · HumanoidTroll CR 5 · GiantTroll (variant) CR 5 · GiantTroll Whelp CR 5 · GiantVapor Lynx CR 5 · MonstrosityWater Elemental CR 5 · ElementalWillowhaunt CR 5 · UndeadVapor Drake CR 6 · DragonVallowex CR 7 · AberrationVenom Troll CR 7 · GiantVine Drake CR 7 · DragonThornheart Guardian CR 9 · ConstructToad King CR 10 · FeyThundercall Hadrosaur CR 11 · MonstrosityTroll Limb CR 1/2 · GiantValkruung CR 1/2 · MonstrosityVegepygmy CR 1/4 · PlantVenom Maw Hydra CR 12 · MonstrosityVenomous Snake CR 1/8 · BeastWastrilith CR 13 · Fiend (Demon)Winged Kobold CR 1/4 · HumanoidWinged Kobold* CR 1/4 · DragonYuan-ti Malison (Type 2) CR 3 · MonstrosityYuan-ti Malison (Type 3) CR 3 · MonstrosityYuanti Malison (Type 4) CR 3 · MonstrosityYoung Spinosaurus CR 5 · Beast (Dinosaur)Zmey Headling CR 5 · DragonYoung Black Dragon CR 7 · Dragon (Chromatic)Yuan-ti Abomination CR 7 · MonstrosityYuan-ti Abomination* CR 7 · MonstrosityWood Hag CR 9 · Fey