Giovan Battista Nani (30 August 1616, Venice – 5 November 1678, Venice), in French Jean Baptiste Felix Gaspard Nani, was a Venetian ambassador, librarian, archivist, amateur botanist and historian, born into a patrician family.For 25 years (1643–68) Battista was the Republic of Venice's ambassador to France, as well as making several diplomatic missions into Germany.
He later became Procurator of St Mark's.
He wrote a history of the Republic of Venice in his free time, the Historia della Republica Veneta (dal 1613 al 1671), which was translated into French by François Tallemant (1679) and Masclary (1702), and continued by Michele Foscarini and Piero Garzoni.
Nani wrote about the Conspiracy of Spain against the Venetian Republic, set up by the Marquis de Bedmar.