The Sidi Abderrahmane Mosque is a mosque in the Casbah of Algiers dating from the  17th century. Built around 1621, it is a small mosque and mausoleum (koubba) dedicated to the thinker and theologian Sidi Abderrahman et-Thaâlibi (1384-1471). The mosque itself dates from 1696; it was built around the tomb of the theologian within the walls of the Zaouïa of Sidi Abderrahmane

We do not know much about the tomb built in 1471 (following the death of Sidi Abd er-Rahman), nor even if there was a construction. In 1621 (143 years after his death), the memory and reputation of the theologian still being alive, it was decided to build him a mausoleum more worthy of his memory. The burial chamber has 8 groups of three half-columns engaged in the four walls. Each half-column has a base and a capital carved from the same block of white marble. These pillars serve as support for the four arches (probably added later) included in the structure of the domed ceiling. This domed ceiling supports a rectilinear roof with 4 slopes covered with tiles; in this sense, the koubba is of the Maghreb type like those found in Tlemcen or Fez, presents similarities with the Saadian tombs , whose plan was very popular at the time.

The government of the deys could not ignore the tomb of the theologian who had made Algiers’ reputation in the West as well as in the East. It was Dey Hadj Ahmed el Atchi who decided to transform the tomb into a mosque in 1696, more precisely into a zaouïa . The Maghreb-style koubba was to be influenced by a new style, with a domed roof similar to that of Anatolia. The burial chamber was equipped with a mihrab with two small columns and earthenware from Asia Minor and served as an oratory, which may seem a suspicious feature in the light of Islam, which forbids prayer on a tomb. A square minaret was added to the ensemble for the call to prayer.