Gennaro Maria Sarnelli (12 September 1702 – 30 June 1744) was an Italian Roman Catholic priest and a professed member from the Redemptorists.
Sarnelli was one of Saint Alphonsus Maria de' Liguori's earliest companions and was also a prolific writer during his life; he wrote on a range of religious topics which still survive.
He wanted to become a Jesuit though was dissuaded from this before working in the Hospital of the Incurables where he call to the priesthood blossomed.
His apostolic zeal knew no limits: he preached missions and aided his friend Liguori in his work; he tended to the sick and helped to get girls out of prostitution despite the threats levelled against him.Sarnelli's fame for holiness was a well-known fact during his life and his beatification cause did not open until 1861 in Naples; formal introduction came in 1874 and he was named as Venerable on 2 December 1906.