La Paleozoología es la parte de la Paleobiología sistemática que estudia los animales fósiles. Puede subdividirse en tantas partes como taxones se estudian en Zoología, como Paleoantropología (hombres fósiles), Paleomastología (mamíferos fósiles), Paleornitología (aves fósiles), Paleoherpetología (anfibios, reptiles y dinosaurios fósiles), Paleoentomología (insectos fósiles), Paleomalacología (moluscos fósiles), etc.

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Palaeozoology, also spelled as Paleozoology (Greek: παλαιόν, palaeon "old" and ζῷον, zoon "animal"), is the branch of paleontology, paleobiology, or zoology dealing with the recovery and identification of multicellular animal remains from geological (or even archeological) contexts, and the use of these fossils in the reconstruction of prehistoric environments and ancient ecosystems. Definitive, macroscopic remains of these metazoans are found in the fossil record from the Ediacaran period of the Neoproterozoic era onwards, although they do not become common until the Late Devonian period in the latter half of the Paleozoic era. Perhaps the best known macrofossils group is the dinosaurs. Other popularly known animal-derived macrofossils include trilobites, crustaceans, echinoderms, brachiopods, mollusks, bony fishes, sharks, Vertebrate teeth, and shells of numerous invertebrate groups. This is because hard organic parts, such as bones, teeth, and shells resist decay, and are the most commonly preserved and found animal fossils. Exclusively soft-bodied animals—such as jellyfish, flatworms, nematodes, and insects—are consequently rarely fossilized, as these groups do not produce hard organic parts.

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