- Paasselkä devils (Finnish) – Spectral fire
- Pakhangba (Meitei mythology and Sanamahism) – Serpentine dragon, ruler of the universe
- Pamola (Abenaki) – Weather spirit
- Panes (Greek) – Human-goat hybrids descended from the god Pan
- Pandi (Medieval Bestiary) – White-haired humanoid with giant ears and eight fingers and toes
- Panis (Hindu) – Demons with herds of stolen cows
- Panlong (Chinese) – Water dragon
- Panotti (Medieval Bestiaries) – Humanoid with gigantic ears
- Panther (Medieval Bestiaries) – Feline with sweet breath
- Parandrus (Medieval Bestiaries) – Shapeshifting animal whose natural form was a large ruminant
- Pard (Medieval Bestiaries) – Fast, spotted feline believed to mate with lions to produce leopards
- Pardalokampoi (Etruscan) – Fish-tailed leopard
- Patagon (Medieval folklore) – Giant race reputed to live in the area of Patagonia
- Patasola (Latin America) – Anthropophagous, one-legged humanoid
- Patupairehe (Māori) – White-skinned nature spirits
- Pech (Scottish) – Strong little people
- Pegaeae (Greek) – Spring nymph
- Pegasus (Greek) – Winged horse
- Pegacorn – Pegasus-unicorn hybrid
- Pelesit (Malay) – Servant spirit
- Peluda (French) – Dragon
- Penanggalan (Malay) – Vampires that sever their heads from their bodies to fly around, usually with their intestines or other internal organs trailing behind
- Peng (Chinese) – Giant bird
- Penghou (Chinese) – Tree spirit
- Peri (Persian) – Winged humanoid
- Peryton (Allegedly Medieval folklore) – Deer-bird hybrid
- Pesanta (Catalan) – Nightmare demon in the form of a cat or dog
- Peuchen (Chilota and Mapuche) – Vampiric, flying, shapeshifting serpent
- Phi Tai Hong (Thai) – Ghost of a person who has died suddenly of a violent or cruel death
- Phoenix (Phoenician) – Regenerative bird reborn from its own ashes
- Piasa (Native American mythology) – Winged, antlered feline-like dragon
- Piatek (Armenian) – Large land animal
- Pictish Beast (Pictish stones) – Stylistic animal, possibly a dragon
- Pillan (Mapuche) – Nature spirit
- Pim-skwa-wagen-owad (Abenaki) – Water spirit
- Piru (Finnish) – Minor demon
- Pishacha (Hindu) – Carrion-eating demon
- Pishtaco (Peru) – Monster man that steals its victim's body fat for cannibalistic purposes
- Pita-skog (Abenaki) – Serpentine rain spirit
- Pixie (Cornish) – Little people and nature spirits
- Pixiu (Chinese) – Winged lion
- Pi yao (Chinese) – Horned, dragon-lion hybrid
- Plakavac (Slavic) – Vampire created when a mother strangles her child
- Pok-wejee-men (Abenaki) – Tree spirit
- Polevik (Polish) – Little people and field spirits
- Pollo Maligno (Colombian) – Man-eating chicken spirit
- Polong (Malay) – Invisible servant spirit
- Poltergeist (German) – Ghost that moves objects
- Pombero (Guaraní) – Wild man and nature spirit
- Ponaturi (Māori) – Grotesque, malevolent humanoid
- Pontianak (Malay) – Undead, vampiric women who died in childbirth
- Pope Lick Monster (American Folklore) Kentucky Urban Legend – Cryptid, a murderous creature that is part man, sheep, and goat
- Poubi Lai (Meitei mythology) – Evil dragon python from the Loktak lake
- Pouākai (Māori) – Giant bird
- Preta (Buddhist, Hindu, and Jain) – Ghosts of especially greedy people
- Pricolici (Romanian – Roman) – Undead wolf
- Psoglav (Serbia) – Dog-headed monster
- Psotnik (Slavic) – Mischievous spirit
- Psychai (Greek) – Butterfly-winged nymphs, daughters of Psyche
- Psychopomp (Greek) – Creatures, spirits, angels, or deities in many religions who escort newly deceased souls from Earth to the afterlife
- Púca (Welsh) – Shapeshifting animal spirit
- Púki (Icelandic) – Malevolent little person
- Puck (English) – House spirit
- Putz (German) – House spirit
- Pugot (Philippine) – Headless humanoid
- Puk (Frisian) – House spirit
- Pūķis (Latvian) – Dragon
- Puckwudgie (Native American mythology) – Troll-like gray-skinned being
- Pygmy (Greek) – Little people
- Pyrausta (Greek) – Insect-dragon hybrid
- Python (Greek) – Serpentine dragon