San Martino, Former monastery and museum on Vomero hill in Naples, Italy

San Martino is a Carthusian monastery complex on the Vomero hill in Naples, now housing the Museo Nazionale di San Martino. It has two monumental cloisters: the Chiostro Grande, rebuilt at the end of the 16th century with 60 arches on 64 columns of grey and white marble and piperno, and the Chiostro dei Procuratori, with marble pilasters and a well by Felice de Felice (1605–1608).

The first and only cloister of the charterhouse was built in the 14th century at the wish of Robert of Anjou and his son Charles, Duke of Calabria, and was completed about fifty years later under Joan I of Naples. It was a large square cloister with seventeen arcades per side. In 1578 renovation and expansion began under Giovanni Antonio Dosio: the existing cloister became the Great Cloister, and the Cloister of the Procurators and the Prior's Quarter cloister were added.

The cloister of the Procurators displays city coats of arms, sculptures and inscriptions placed there in 1900 during the first installation of the National Museum of San Martino. The Great Cloister holds eight full-length statues on its balustrade, including a Madonna and Child by Giovan Battista Perasco dated 1594 and a Risen Christ by Michelangelo Naccherino.

The two cloisters sit inside the Certosa di San Martino complex on the Vomero hill, reached from Piazza Vanvitelli. The Procuratori cloister lies at the end of the sixteenth-century wing; the Grande cloister, with its marble balustrade and eight statues, opens onto the friars' cells facing the city. The 1578 cistern, fifty metres deep, is entered by an internal tufa stair.

The cloister's cistern, built in 1578 and modified by Cosimo Fanzago in 1623, is 50 metres deep and 8.5 metres wide, reached by an internal tuff staircase and a suspended walkway. Its octagonal parapet is decorated with monster heads and topped by two Doric columns with three small obelisks in pink Gargano breccia.