The Great Mosque of Kairouan, also known as the Mosque of Uqba, is a mosque situated in the UNESCO World Heritage town of Kairouan, Tunisia and is one of the most impressive and largest Islamic monuments in North Africa.

At the foundation of Kairouan in 670, the Arab general and conqueror Uqba ibn Nafi (himself the founder of the city) chose the site of his mosque in the center of the city, near the headquarters of the governor. Around 690, shortly after its construction, the mosque was destroyed during the occupation of Kairouan by the Berbers, originally conducted by Kusaila. It was rebuilt by the Ghassanid general Hasan ibn al-Nu'man in 703.

The interior includes a staircase of 129 steps, surmounted by a barrel vault, which gives access to the terraces and the first tier of the minaret. The courtyard façade (or south façade) of the tower is pierced with windows that provide light and ventilation, while the other three façades—facing north, east and west—are pierced with small openings in the form of arrowslits. The minaret, in its present aspect, dates largely from the early ninth century, about 836 AD. It is the oldest minaret in the Muslim world, and it is also the world's oldest minaret still standing.