Un piscívoro es un animal carnívoro que se alimenta principalmente de peces. Fue la dieta de los primeros tetrápodos (anfibios), posteriormente surgieron los insectívoros y con el tiempo algunos reptiles se convirtieron en herbívoros. Algunos animales, como los leones marinos o aligatores, son parcialmente piscívoros mientras otros como la jineta piscívora, son dependientes por completo de peces. Las palabra piscívoro se deriva del latín «piscis».

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A piscivore /ˈpɪsᵻvɔər/ is a carnivorous animal which eats primarily fish. Piscivorous is equivalent to the Greek-derived word ichthyophagous. Fish were the diet of early tetrapods (amphibians); insectivory came next, then in time, reptiles added herbivory. Some animals, such as the sea lion and alligator, are not completely piscivorous, often preying on aquatic invertebrates or land animals in addition to fish, while others, such as the bulldog bat and gharial, are strictly dependent on fish for food. Humans can live on fish-based diets as can their carnivorous domesticated pets, such as dogs and cats. The name "piscivore" is derived from the Latin word for fish, piscis. Some creatures, including cnidarians, octopi, squid, spiders, sharks, cetaceans, grizzly bears, jaguars, wolves, snakes, turtles, and sea gulls, may have fish as significant if not dominant portions of their diets.

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