There are a number of lists of fictional species:
List of fictional extraterrestrials (by media type)
List of fictional extraterrestrials by form
List of non-sentient alien species
Lists of fictional alien species: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z
List of fictional humanoid species
Literature
Comics
Television
Film
Video games
List of legendary creatures
List of legendary creatures by type
List of giants in mythology and folklore
Vampire folklore by region
Legendary creatures of the Argentine Northwest region
Mythical creatures in Burmese folklore
List of Greek mythological creatures
List of legendary creatures from Japan
List of Philippine mythical creatures
Philippine mythical creatures
Supernatural beings in Slavic folklore
List of fictional plants
List of dragons
List of dragons in mythology and folklore
List of dragons in literature
List of dragons in popular culture
List of fictional dinosaurs
List of theological angels
List of fictional angels
List of theological demons
List of fictional demons
Lists of fictional species Wikipedia (Text) CC BY-SA