In Norse mythology, a dís ("lady", plural dísir) is a ghost, spirit or deity associated with fate who can be both benevolent and antagonistic towards mortal people. Dísir may act as protective spirits of Norse clans. Their original function was possibly that of fertility goddesses who were the object of both private and official worship called dísablót, and their veneration may derive from the worship of the spirits of the dead. The dísir, like the valkyries, norns, and vættir, are almost always referred to collectively. The North Germanic dísir and West Germanic Idisi are believed by some scholars to be related due to linguistic and mythological similarities, but the direct evidence of Anglo-Saxon and Continental German mythology is limited. The dísir play roles in Norse texts that resemble those of fylgjur, valkyries, and norns, so that some have suggested dísir is a broad term including the other beings.

The basic meaning of the word dís is "goddess".^{[dubious – discuss]} It is now usually derived from the Indo-European root *dhēi-, "to suck, suckle" and a form dhīśana.