Nyx is a symphonic poem by the Finnish composer Esa-Pekka Salonen. The work was jointly commissioned by Radio France, the Barbican Centre, the Atlanta Symphony Orchestra, Carnegie Hall, and the Finnish Broadcasting Company. It was premiered February 19, 2011 in the Théâtre du Châtelet, Paris, with Salonen conducting the Orchestre Philharmonique de Radio France. The piece is titled after the Goddess Nyx from Greek mythology.