thumb|[[Januarius|Saint Gennaro, bishop and martyr, by Caravaggio|300px]]
The Feast of San Gennaro (in Italian: Festa di San Gennaro), also known as San Gennaro Festival, is a Neapolitan and Italian-American patronal festival dedicated to Saint Januarius, patron saint of Naples and Little Italy in Lower Manhattan.
His feast is celebrated on 19 September in the calendar of the Catholic Church.
In the United States, the "Festa of San Gennaro" is also a highlight of the year for New York's Little Italy, with the saint's polychrome statue carried through the middle of a street fair stretching for blocks.
In Italy
History
thumb|150px|Drawing of the reliquary containing the two ampoules said to hold Januarius' blood, c. 1860
On 19 September 305, Gennaro (), bishop of Benevento, was beheaded in Pozzuoli during the persecution of Christians by Diocletian.