Giovanni Gaeta (1884 – 24 June 1961) was the real name of the Italian poet, writer and musician better known as E. A. Mario. He took the E of his assumed name from the initial letter of the pseudonym Ermes under which he wrote for the newspaper Il Ventesimo; the A came from Alessandro, the paper's chief editor; and Mario was the name of its Polish director.

Gaeta composed and wrote the lyrics to more than 2,000 works in Italian and Neapolitan. In 1918, he wrote La leggenda del Piave, which at the birth of the Italian Republic was a candidate for the Italian national anthem. His other famous works include Santa Lucia luntana, Balocchi e profumi, Vipera, Rose rosse, and O' Paese dò sole.