Republic Square (Maltese: Misraħ ir-Repubblika) is a piazza in Valletta, Malta. The square was originally called Piazza Tesoreria or Piazza dei Cavallieri, since the treasury of the Order of Saint John was located in the square. After a statue of Queen Victoria was installed in the square in the 19th century, it became known as Queen's Square or Piazza Regina (Maltese: Pjazza Reġina). Today, although its official name being Republic Square, it is still commonly referred to as Piazza Regina.
Originally the site was a square called Piazza dei Cavalieri, but during the British period it was converted to an orange garden with a cafeteria. At one point, Governor Le Marchant move the statue of Grand Master Manoel from Fort Manoel to the middle of this piazza. In 1887 this statue was moved to Floriana, and replaced by a statue of Queen Victoria in commemoration of her 50th birthday.
The northwest part of the square consists of a large building originally known as the Casa del Commun Tesoro. The building housed the accounts, contracts and records of the treasury of the Order of Saint John. The first post office in Malta was opened in the building in 1708, and part of it remained a post office until 1849. Over the years, La Casa del Comun Tesoro also housed government offices, a hotel and a cinema. The building was damaged in World War II, but it was repaired and it now houses the Casino Maltese. Some parts of the ground floor are occupied by cafés and shops.
The southeast side of the square, facing the Casa del Commun Tesoro, is the National Library of Malta, commonly known as the Bibliotheca. The building was commissioned when larger premises were required for the Order's library. It was designed by the Polish Italian architect Stefano Ittar, and was completed in 1796. Due to the French occupation of Malta, the library did not open until Malta became a British protectorate. It was officially inaugurated by Civil Commissioner Sir Hildebrand Oakes in 1812. The library has remained there ever since.