Piscine and amphibian humanoids (people with the characteristics of fish or amphibians) appear in folklore and fiction.^[1]

Folklore

Myth

• Adaro from the mythology of the Solomon Islands
• Atargatis from Assyrian mythology
• Blue men of the Minch ("na fir ghorma": Scottish Gaelic pronunciation: [nə fiɾʲ ˈɣɔɾɔmə])
• Dagon, wrongly identified as a fish-god^[2]
• Ea from Babylonian mythology
• Kulullû from Babylonian mythology
• Glaucus, mortal transformed into a merman in Greek mythology
• Heqet, ancient Egyptian frog-headed goddess of fertility.
• Huh, ancient Egyptian frog-headed god whose name means "endlessness".
• Iara and Ipupiara from Brazilian mythology
• Mami Wata from the mythology of the Southern Africa
• Matsya, avatar of Vishnu in piscine form
• Nommo fish-like amphibian spirits in Dogon mythology.
• Oannes from Babylonian mythology
• Pania and Ponaturi from Māori mythology
• Pincoys and La Sirena chilota, princess of the sea from Chilote mythology
• Rusalki from Slavic mythology
• Siyokoy in Philippine mythology
• Triton, son of Poseidon
• Vodyanoy from Slavic mythology
• Yacuruna from the indigenous people of the Amazon

Legend

• The Amabie from Japanese folklore
• The ceasg in Scottish folklore
• Finfolk from the folklore of Orkney
• Kappa from Japanese folklore
• Melusine in European folklore
• The Neck from Scandinavian folklore
• The Ningyo from Japanese folklore
• Merrows from Irish folklore
• The Umibōzu from Japanese folklore
• Sirens, while initially described as birdlike, but have become associated with mermaids in later folklore.
• The Loveland Frogman.

Hoaxes

• Fiji mermaids, taxidermic hoaxes exhibited by P. T. Barnum and others

Fiction

Literature

• Grendel and Grendel's mother from Beowulf
• The Little Mermaid, from Hans Christian Andersen's Fairy Tales (1837)
• The underwater people from H. G. Wells's story "In the Abyss" (1896)^[3]
• The harbor master from Robert W. Chambers's story "The Harbor-Master" (1899)^[4]
• Mr. Toad from The Wind in the Willows (1908)
• The fish man from Irvin S. Cobb's story "Fishhead" (1913)^[4]
• The Frogman, from L. Frank Baum's The Lost Princess of Oz (1917)
• Ichthyander from Alexander Belyayev's Amphibian Man (1928)^[5]
• The Deep Ones from H. P. Lovecraft's The Shadow Over Innsmouth (1936)^[4]
• The Newts from Karel Čapek's War with the Newts (1936)^[6]
• The Myposans from Edgar Rice Burroughs's "Slaves of the Fish Men" (1941)
• Marsh-wiggles from C. S. Lewis's The Silver Chair (1953)
• Swimmers from C. M. Kosemen's All Tomorrows (2006)

Comics

• The Fish Men from Buck Rogers comic strips
• The Shark Men from Flash Gordon comic strips
• Namor, the Sub-Mariner, from the Marvel Universe
• Aquaman from DC Comics
• The Water People from Carl Barks's story "The Secret of Atlantis"
• Frog-Man, and the Ani-Men version of Frog-Man, from Marvel Comics
• Abe Sapien and the "frog monsters" from the Hellboy comics
• Pepe the Frog, a comic character and Internet meme
• The Trench in DC Comics.

Films

• The frog people from The Mysterious Island (1929)^[7]
• The Gill-man from Creature from the Black Lagoon (1954)^[8]
• The Gill-man from The She-Creature (1956)^[9]
• The Gill-man from The Monster of Piedras Blancas (1958)^[9]
• The Gill-men from City Under the Sea (1965)^[10]
• The titular creatures from Humanoids from the Deep (1980)
• The aquatic aliens from The Abyss (1989)
• Chocki, the shark-man from Cabin Boy (1994)
• The "Mariner" from Waterworld (1995)
• The Gungans from Star Wars (1999)
• The Amphibian Man from The Shape of Water (2017)

Games

• The Argonians from Elder Scrolls
• Aulbath (a.k.a. Rikuo) from the video game series, Darkstalkers, by Capcom
• The Battletoads from the video game series of the same name
• Bullywug from the Dungeons & Dragons role-playing game setting
• The Rokea from the roleplaying game Werewolf: the Apocalypse
• The Sahuagin from the Dungeons & Dragons role-playing game setting
• The Salarians, a race in the Mass Effect series
• The Murloc are a species of amphibious creatures which live in tribes in World of Warcraft
• The Naga are a species of aquatic humanoids under the command and leadership of Queen Azshara in World of Warcraft
• The tritons from the Dungeons & Dragons role-playing game setting
• Zoras from The Legend of Zelda
• Neptuna, the mermaid-like boss in Croc: Legend of the Gobbos

Television

• The Aquaphibians from the Stingray TV series
• The Sea Devils from Doctor Who
• The race of Cabira (one of Chilled's henchmen) is a race of fish-like humanoids from Dragon Ball
• Crazy Frog
• The Fishmen are a race of fish-like humans from the anime One Piece. They are modeled after different aquatic lifeforms. The Fishmen can breed with Giants to create Wotans.
• Gill (aka Gil Moss) from "Kim Possible"
• Goo from Gumby
• Molly, Gil, Goby, Deema, Oona and Nonny from Bubble Guppies
• Sil, from Doctor Who
• The TigerSharks in the cartoon series of the same name
• In the Dragon Ball Z series, the alien race of Sūi' (one of Frieza's foot soldiers) is a race of humanoid fish-like aliens, who worked in the Galactic Frieza Army
• The characters of Amphibia, a world of anthropomorphic frogs and other amphibians.
• Kermit the Frog and Robin the Frog from The Muppets
• Michigan J. Frog, star of the Looney Tunes short One Froggy Evening and onetime mascot of The WB
• The Hynerians from Farscape
• Some characters in Nagi-Asu: A Lull in the Sea are humans having the ability to breathe underwater (called Ena)
• The Kanassans are a race of fish-like humanoids from the planet Manassas. They are said to possess psychic abilities, including being able to read minds and see into the future. They featured in the special Dragon Ball Z: Bardock - The Father of Goku
• Mer-Man from the Masters of the Universe franchise
• The Fish People from the radio broadcast Alexei Sayle and the Fish People
• Hippocampus from Krapopolis is a piscine humanoid. The episode "Prince Hippo" revealed that he is part of a race of Atlantean fish-men with his mother being the unnamed Queen of Atlantis.