Gennaro Portanova (born 11 November 1845 in Naples, Italy, died 25 April 1908 in Reggio Calabria) was a cardinal of the Catholic Church, and was bishop of Ischia after the large earthquake there, and later archbishop of Reggio Calabria 1888–1908.
He was made cardinal in 1899 by Pope Leo XIII.
He took part in the 1903 conclave which elected Pope Pius X.