Erriapus (also Eriapus) was a tutelary deity worshipped in southern Gaul.
Several inscriptions to the god are known. There was an important cult site to him at Saint-Béat (Haute-Garonne).
One image is known of him, a stone altar of the 2nd century CE found in Saint-Béat on which he is identified as . In this image, he is depicted naked and with a club. His iconography shows the influence of the Roman god Silvanus.
He is the protective deity of either the Montagne d'Arrie in Saint-Béat (as Daniel Nony and Michel Labrousse suggest) or a local spring (as Carole Billod suggests).
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