The Mazin Bin Ghadoubah Mosque (), also known as Masjid Al-Miá¸ÂmÃÂr (), is a mosque located in Samail, Ad Dakhiliyah Governorate, Sultanate of Oman. Founded by the Omani companion of the Islamic prophet Muhammad, and completed in C.E., it is the oldest mosque in the country. Built in stone and marble, the mosque was restored and renovated in 1979 and in 2017.