The Bou Merouane Mosque is a mosque located in Annaba, Algeria. It was built in 1033 by the Zirid ruler Al-Muizz ben Badis. The mosque is built of plaster mortar, lime mortar, brick, and stone. The exterior architectural decoration is designed in brick, with some marble slabs. The interior decoration is made of ceramic tiles, carved wooden panels, and sculpted plaster.

Sidi Bou Marouan Mosque is located at the top of the old city. The prayer hall is built on the rock, but the terrace that surrounds it on both the northern and eastern sides is built over two levels of caves that could have existed before the mosque itself. The sahn (court) has gone through too many transformations for its original state to be understood.

The hypostyle prayer hall has seven naves perpendicular and seven parallel to the qibla wall, thus determining arches in both directions. The courtyard was surrounded by porticoes. The quadrangular minaret with its three stacked shafts closely resembles the minaret of the Great Mosque of Sfax. Its lower part houses a small oratory with a mihrab. The only monument with a tower and a prayer room is the Khalaf Tower in Sousse, but it is not a minaret. The Abu Marwan Mosque is said to be the only known mosque with a prayer room in its minaret.

Sidi Bou Marouan Mosque used to have two domes surmounting the narthex, which disappeared after 1830. The dome were decorated with zigzag gadroons evoking those of the Qarawiyyin Mosque in Fez and the Qubbat ibn al-Qhaoui in Sousse.