Giovanni Battista Pergolesi (4 January 1710 – 16 March 1736) was an Italian composer, violinist and organist.
Born in Iesi in what is now the Province of Ancona (but was then the Papal States), Pergolesi studied music there under a local musician, Francesco Santini, before going to Naples in 1725, where he studied under Gaetano Greco and Francesco Feo among others. He spent most of his brief life working for aristocratic patrons like the Colonna principe di Stigliano, and duca Marzio IV Maddaloni Carafa.
Pergolesi was one of the most important early composers of opera buffa (comic opera). His opera seria, Il prigionier superbo, contained the two act buffa intermezzo, La Serva Padrona (The Servant Mistress, 28 August 1733), which became a very popular work in its own right. When it was performed in Paris in 1752, it prompted the so-called Querelle des Bouffons ("quarrel of the comic actors") between supporters of serious French opera by the likes of Jean-Baptiste Lully and Jean-Philippe Rameau and supporters of new Italian comic opera. Pergolesi was held up as a model of the Italian style during this quarrel, which divided Paris's musical community for two years.