Islamic religious practices and water hold a very close relationship determined, mainly, by the need of the faithful to perform ritual ablutions before prayer. However, the archaeological documentation of infrastructure related to this practice in al-Andalus is very infrequent. For this reason, a recent discovery from the western outskirts of Madīnat Qurṭuba (Córdoba), consisting of a secondary mosque with a small ablution room attached to its northern end, stands out for its uniqueness. This mosque has been recovered in one of the most interesting areas for the archaeological and urban study of the city in Islamic times, the so-called „Plan Parcial O-7“. This sector has been excavated almost entirely in recent years, revealing interesting dynamics of urban configuration already from the 8th century, which allow a better and deeper understanding of the medieval Islamic city, its components and its functions.