Pietro Deiro (1888 – 1954) was one of the most influential accordionists of the first half of the 20th century. Born on August 28, 1888 in , Italy, the younger brother of Guido Deiro, Pietro Deiro emigrated to the United States as a steerage passenger on the S/S La Savoie in 1907 and went to live with his Uncle Frederico and work in the coal mines of Cle Elum, Washington. Pietro Deiro was the first president of the American Accordionists Association (1938) and promoted himself as "The Daddy of the Accordion," much to his brother Guido's chagrin. Pietro died in 1954.