Giuseppe Maria Nelvi (1698–1756) was an Italian composer of sacred music, opera, and oratorio.
In 1718, at the age of 20, he was appointed maestro di cappella at the Confraternity of Santa Maria della Morte and in 1722 became a member of the Accademia Filarmonica di Bologna.
In 1727 he went to Ukraine to serve as the music director for General Stanisław Mateusz Rzewuski, a post previously held by Giovanni Antonio Ricieri.
There he worked in Frankfurt and Hamburg and was the composer to the Thurn und Taxis court in Regensburg, a post which he held until 1734.
On his return to Bologna he was made a "Principe" (Prince) of the Accademia Filarmonica.