Claudio Guastalla was an Italian opera librettist.
Guastalla was born in Rome on 7 November 1880 and died probably in the same city in 1948.
Especially important was his collaboration with the composer Ottorino Respighi.
Guastalla wrote fifteen libretti. Among them:
La grazia, opera in 2 acts, music by Vincenzo Michetti, Rome, Teatro Costanzi, 31 March 1923 (after Grazia Deledda)Belfagor, commedia lirica in 1 prologue, 2 acts and 1 epilogue, music by Ottorino Respighi, Milan, Teatro alla Scala, 26 April 1923Die versunkene Glocke (La campana sommersa), opera in 4 acts, music by Ottorino Respighi, Hamburg, Stadttheater, 18 November 1927Odette , opera in 3 acts, music by Mario Marangolo, Brescia, Teatro Grande, 1929Maria egiziaca , mistero lirico in 1 act and three episodes, music by Ottorino Respighi, New York City, Carnegie Hall, 16 March 1932La fiamma , melodramma in 3 acts, music by Ottorino Respighi, Rome, Teatro dell'Opera, 23 January 1934Lucrezia , opera in 1 act, music by Ottorino Respighi, Milan, Teatro alla Scala, 24 February 1937Gli Orazi , opera (istoria per musica) in 1 act, music by Ennio Porrino, Milan, Teatro alla Scala, 1 February 1941Guastalla was also the author of the subject of Respighi's ballet Belkis, regina di Saba (1932) and collaborated with Respighi for a revision (1934) of the libretto of L'Orfeo of Claudio Monteverdi.