Sidi Okba Mosque is a historical mosque and the oldest mosque in Algeria. The mosque is located in the Sidi Okba commune in the Biskra Province, Algeria. It was originally built in 686 AD as a mausoleum for the great Muslim conqueror, Uqba ibn Nafi, a military commander and one of the most prominent leaders of the Islamic conquest of Morocco during the era of the Rashidun and Umayyad Caliphates. The mosque has been renovated and expanded several times throughout its long history.