Giovanni Battista (also Giambattista) Piranesi (Italian pronunciation: [dʒoˈvanni batˈtista piraˈnesi]; 4 October 1720 – 9 November 1778) was an Italian artist famous for his etchings of Rome and of fictitious and atmospheric "prisons" (Carceri d'Invenzione).

The Prisons (Carceri d'invenzione or 'Imaginary Prisons'), is a series of 16 prints produced in first and second states that show enormous subterranean vaults with stairs and mighty machines.

Piranesi was born in Mogliano Veneto, near Treviso, then part of the Republic of Venice. His brother Andrea introduced him to Latin and the ancient civilization, and later he studied as an architect under his uncle, Matteo Lucchesi, who was Magistrato delle Acque, a Venetian engineer who specialized in excavation.

An in-depth analysis of Piranesi's Carceri was written by Marguerite Yourcenar in her Dark Brain of Piranesi: and Other Essays (1984). Further discussion of Piranesi and the Carceri can be found in The Mind and Art of Giovanni Battista Piranesi by John Wilton-Ely (1978). The style of Piranesi was imitated by 20th-century forger Eric Hebborn.