Naïs is an eighteenth-century opera by Jean-Philippe Rameau.
Nais may also refer to: Naïs (film), a 1945 French film Nais (Lydia), a town of ancient Lydia Naïs (mythology), several women in Greek mythology
Biology Nais (fungus), a genus of fungi in the family Halosphaeriaceae Nais (annelid), a genus of oligochaete worms in the family Naididae Nais, an invalid genus of butterflies in the family Lycaenidae; nowadays part of Chrysoritis
See also NAIS (disambiguation) Nise (disambiguation) Nice (disambiguation) Gneiss, a type of metamorphic rock