The Augustinian Church, Sacristy, Oratory and Priory comprise one whole block (insula) of Valletta between Old Bakery, St John, Zachary and St Mark Streets.

This current church replaced an earlier one which was adjacent to it and facing in the opposite direction. The remains of the earlier church are still visible in the underground spaces beneath the current Augustinian convent. St Augustine is one of the churches built during the early years of Valletta. The foundation stone was laid in 1571.

A life-size statue of St Augustine of Hippo dressed as a bishop is located on Old Bakery Street corner with St John Street. An earlier statue was destroyed in April 1943.

The sacristy consists of a rectangular space with a second attic and vaulted roof. The main interior features are the read deal furnishing, finished with rich carvings in the Corinthian order.

The Priory building is mostly on three floors at Old Bakery Street with another two floors of rented housing and shops beneath the convent onto Zachary Street compensating for the difference in level between the two streets. The oratory occupies part of the ground floor beneath the Augustinian Convent. Structural changes were made in 1845, converting part of it into a sacristy. The side entrance to the Oratory's sacristy onto St Mark Street was concealed behind a deteriorated wooden shop front until 2007.

Mepa scheduled the Church of St Augustine together with the statue of St Augustine, the Sacristy, Priory and Oratory as Grade 1 national monuments as per Government Notice No 276/08 in the Government Gazette dated March 28, 2008.