The Molla Çelebi Mosque (Turkish: Molla Çelebi Camii), sometimes known as Fındıklı Mosque (Turkish: Fındıklı Camii) also as The Hazelnut is an Ottoman mosque located in the Fındıklı neighbourhood of Beyoğlu district in Istanbul, Turkey. It was built by Ottoman architect Mimar Sinan under the order of Kazasker Mehmet Vusuli Efendi, Chief Judge of Istanbul.