Calu () is an epithet of the Etruscan chthonic fire god Śuri as god of the underworld, roughly equivalent to the Greek god Hades (; ); moroeover, as with Hades, this god-name was also used as a synonym for the underworld itself.

He is identified by his wolf attributes, such as a wolf-like appearance or a human with a wolf-skin cap.
The visual representations of the cult of Calu seem to contain common elements with the Roman cult of Lupercalia and the Faliscan cult of the Hirpi Sorani ("wolves of Soranus", from ).

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Etruscan religion
Wolves in folklore, religion and mythology
Etruscan gods
Underworld gods
Epithets of Śuri