Nicola d'Arienzo (24 December 1842 – 25 April 1915) was an Italian composer, music pedagogue, and writer on music. He spent his entire career in his native Naples where all but one of his nine of his operas were premiered. His other compositions included instrumental and sacred music and art songs. From 1909 until 1911, d'Arienzo served as the director of the Conservatory of San Pietro a Majella having taught there since 1875. He also wrote several books on the history and theory of music.