Fort Saint Elmo is a star fort in Valletta, Malta. It stands on the seaward shore of the Sciberras Peninsula that divides Marsamxett Harbour from Grand Harbour, and commands the entrances to both harbours along with Fort Tigné and Fort Ricasoli. It is best known for its role in the Great Siege of Malta in 1565.

By 1417, the local militia had already established a permanent watch post on the tip of the Sciberras Peninsula. In 1488, the Aragonese built a watchtower on Saint Elmo Point, and it was dedicated to Erasmus of Formia, better known as Saint Elmo. In 1533, the Order of Saint John reinforced the tower due to its strategic location. In 1551, an Ottoman raid occurred in which the Turkish fleet sailed into Marsamxett Harbour unopposed. Due to this, it was decided that a major expansion was necessary, and in 1552 the tower was demolished and a new star fort began to be built. It was designed by a Spanish Engineer named Pietro Pardo.[3] It had a cavalier, a covertway and a tenaille. A ravelin was hastily constructed months before the 1565 siege

In 1565, in the Great Siege of Malta, the Ottomans invaded Malta once again with much more force than in 1551. Fort Saint Elmo was the scene of some of the most intense fighting of this siege, and it held out for nearly a month, withstanding massive bombardment from Turkish cannon deployed on Mount Sciberras that overlooked the fort and from batteries on the north arm of Marsamextt Harbour, the present site of Fort Tigné. The initial garrison of the fort was around one hundred and fifty knights and six hundred soldiers, the majority of whom were Spanish, and sixty armed galley slaves. The garrison could be reinforced by boat from the forts across the Grand Harbour at Birgu and Senglea.

After the siege, Grandmaster Jean Parisot de Valette decided to build a new city on the peninsula. Construction started in 1566, and Francesco Laparelli was sent by the Pope to design the fortifications. The ruined Fort Saint Elmo was rebuilt and integrated within the city walls.

The fort was the site of the first aerial bombardment of Malta on 11 June 1940. Among the people that were in the fort during the air raid was the military doctor Censu Tabone, who later became President of Malta. He survived the attack, but six others were killed in the same air raid.

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