St John's Co-Cathedral is a Catholic co-cathedral in Valletta, Malta, dedicated to Saint John the Baptist. It was built by the Order of St. John between 1573 and 1578, having been commissioned by Grand Master Jean de la Cassière as the Conventual Church of Saint John (Maltese: Knisja Konventwali ta' San Gwann).

The church was designed by the Maltese architect Girolamo Cassar, who designed several of the more prominent buildings in Valletta. In the 17th century, its interior was redecorated in the Baroque style by Mattia Preti and other artists. The interior of the church is considered to be one of the finest examples of high Baroque architecture in Europe.

Following the Great Siege of 1565, St. John's Co-Cathedral was commissioned in 1572 by Jean de la Cassière, Grand Master of the Order of St. John. It was initially named, in the Italian common language of the time, as Chiesa Conventuale di San Giovanni Battista. The church was designed by the Maltese architect Girolamo Cassar, who also designed and oversaw the construction of many important buildings in Valletta.[6][7] It is held that Cassar went to Rhodes to bring a plan of an already existing church that was by then converted to a mosque, to use it as a model for the present co-cathedral. However, Cassar still took decisions over the final design and made modifications, and thus became the sole architect of the co-cathedral.[10] Once St. John's was completed in 1577, it became the new conventual church of the Order instead of St. Lawrence's Church in the Order's former headquarters Birgu.[7] Construction of the oratory and sacristy began in 1598, during the magistracy of Martin Garzez, and they were completed by Grand Master Alof de Wignacourt in 1604

For the first century of its existence, the church's interior was modestly decorated. However, in the 1660s, Grand Master Raphael Cotoner ordered the redecoration of the interior so as to rival the churches of Rome. Calabrian artist Mattia Preti was in charge of the embellishment, and effectively completely transformed the interior in the Baroque style. The annexes on the side of the cathedral were added later and feature the coat of arms of Grand Master António Manoel de Vilhena who reigned from 1722 to 1736

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St Paul's Pro-Cathedral, officially The Pro-Cathedral and Collegiate Church of Saint Paul, is an Anglican pro-cathedral of the Diocese in Europe situated in Independence Square, Valletta, Malta. A "pro-cathedral" is a church with cathedral status though not being the main cathedral. It is one of three cathedrals of the Anglican Diocese of Gibraltar in Europe.

The cathedral was commissioned by the Dowager Queen Adelaide during a visit to Malta in the 19th century when she found out that there was no place of Anglican worship on the island. Prior to this Anglican services were held in a room in the Grand Master's Palace.[2] Built on the site of the Auberge d'Allemagne (the conventual home of the German Knights Hospitaller), the cathedral was designed by William Scamp and was built between 1839 and 1844. Queen Adelaide laid the foundation stone on 20 March 1839 and her banner hangs above the choir stalls. The original plans were designed by Richard Lankasheer; however, the building proved unstable, thus work had to resume on plans by Scamp in 1841. Scamp's designs located the altar on the west side of the church, but the Bishop of Gibraltar had a more conservative view, thus the designs were altered and Scamp designed an apse inside the great doors to hold the sanctuary on the east side.

During World War II the cathedral received minor damage and the roof collapsed, but most of the structure remained intact. During restoration works the original designs by Scamp started to take shape. A quire and rood screen were built on the west side of the cathedral. A pulpit was also incorporated with the screen dedicated to Sir Winston Churchill. The new chancery was dedicated by the Archbishop of Canterbury Geoffrey Fisher on 2 December 1949 in the presence of Princess Elizabeth. The east side of the cathedral was then transformed into a baptistery. The under-croft, constructed from remains of the basement of the Auberge d'Allemagne was never used. In 1928, the Bishop of Gibraltar Nugent Hicks opened the under-croft as the new parish hall. In 1938, it was transformed into a gas-proof air raid shelter, which in the early days of the conflict was used by the chaplain, his wife and scores of Maltese citizens. In 2005 it was restored and upgraded.

The cathedral's steeple is a landmark on its own being notably visible in the Marsamxett Harbour. The church building is listed on the National Inventory of the Cultural Property of the Maltese Islands. On 9 February 2017, the church council launched a project to restore the building and steeple with the aim of raising €3,000,000 to cover the costs.

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