The Palazzo Venezia or Palazzo Barbo, formerly Palace of Saint Mark, is a large early Renaissance palace in central Rome, Italy, situated to the north of the Capitoline Hill. Today the property of the Republic of Italy it houses the National Museum of the Palazzo Venezia. The main (eastern) facade measures 77 metres in length, with a height of about 31 metres. The north wing, containing the "Cibo Apartment", extending westwards, measures 122 metres in length. It covers an area of 1.2 hectares and encloses two gardens and the Basilica of Saint Mark. It was built in the present form during the 1450s by Cardinal Pietro Barbo (1417-1471), titular holder of the Basilica of Saint Mark, who from 1464 ruled as Pope Paul II. Barbo, a Venetian by birth as was customary for cardinals of the Basilica of Saint Mark, lived there even as pope and amassed there a great collection of art and antiquities. During the first half of the 20th century it became the residence and headquarters of the fascist dictator Benito Mussolini, who made notable orations from its balcony to huge crowds filling the Piazza Venezia.

San Marco is a minor basilica in Rome dedicated to Saint Mark the Evangelist located in the small Piazza di San Marco adjoining Piazza Venezia. It was first built in 336 by Pope Mark, whose remains are in an urn located below the main altar. The basilica is the national church of Venice in Rome.