Castel Nuovo (Italian: [kasˌtɛl ˈnwɔːvo]; Neapolitan: Castiello Nuovo; 'New Castle'), often called Maschio Angioino (Italian: [ˈmaskjo andʒoˈiːno]; Neapolitan: Maschio Angiuino; ' Angevin Keep'), is a medieval castle located in front of Piazza Municipio and the city hall (Palazzo San Giacomo) in central Naples, Campania, Italy. Its scenic location and imposing size makes the castle, first erected in 1279, one of the main architectural landmarks of the city. It was a royal seat for kings of Naples, Aragon and Spain until 1815.

It is the headquarters of Società Napoletana di Storia Patria ("Neapolitan Society of Homeland History") and of the Naples Committee of the Istituto per la storia del Risorgimento italiano (Institute for the History of the Italian Risorgimento). In the complex there is also the civic museum, which includes the Palatine Chapel and the museum paths on the first and second floors.

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