Natale Rosario Scalero (24 December 1870 in Moncalieri - 25 December 1954 in Ivrea) was an Italian violinist, music teacher and composer.
By the age of six, Scalero was under the tutelage of Pietro Bertazzi, a violinist, musical instrument maker and instructor at the Conservatorio St. Cecilia in Torino. In 1881, Scalero entered the Liceo Musicale di Torino under Luigi Avalle. At the age of 15, Scalero came under the tutelage of César Thomson. Scalero appears to have returned to his home at Moncalieri for a time for health reasons, before returning to Torino (Turin) to study with Camillo Sivori through 1889, appearing during this time with the Sivorni Quartet.
In 1891, Scalero made his debut as a recitalist in Leipzig, following which he performed in Milan, Rome, London, and throughout Europe to critical acclaim. In 1895, Scaleri went to London to study and assist violinist August Wilhelmj (concert master of the world premiere of Wagner's Ring of the Nibelungs in Bayreuth). In 1900 he left London for Vienna, where he became a composition student of Eusebius Mandyczewski.
1907 returned Scalero to Rome. Here he joined in 1913 the Società del Quartetto and became its musical director and first violinist. In 1919, he was succeeded by Ernest Bloch as a composition teacher at the Mannes School of Music in New York. After 1927, he taught at the famous Curtis Institute of Music in Philadelphia, while apparently keeping a residence in Gressoney. One of his most successful students at Curtis was composer Samuel Barber. during that time he also taught composition to Marc Blitzstein. In 1946 he returned to Montestrutto in Settimo Vittone, Italy, where he died in 1954.