Joaquín Romualdo Gaztambide y Garbayo (Tudela, Navarre, 7 February 1822 – Madrid, 18 March 1870) was one of the most prominent Spanish composers of zarzuela in the mid-nineteenth century. His contribution to the revival of the genre was highly significant; and although during the last century his work virtually disappeared from the Spanish musical scene, the early 21st century has reversed this trend. Of Italianate quality in the manner of Gaetano Donizetti, his music nonetheless makes use of Spanish rhythms and dance forms. Among other renowned works (many in opéra comique form), his La Mensajera (1849), El valle de Andorra (1851), El sueño de una noche de verano, Catalina (1854), Los magiares (1857), El juramento (1858), and the one-act classic Una vieja (1860) stand out.