Etain (also Étain, Étáin) can refer to: Étaín, a character from Irish mythology the fairy princess in Rutland Boughton's opera The Immortal Hour the fairy princess in the play The Immortal Hour (play) Étain, Meuse, a commune in the Meuse département in France Étain-Rouvres Air Base (also Étain Air Base), former name of Base Lieutenant Étienne Mantoux Étain, the French word for tin or pewter