Ömer Nasuhi Bilmen (1883–1971) was a Muslim scholar of fiqh and tafsir, and the fifth president of the Directorate of Religious Affairs of the Republic of Turkey. He is known for his expansive work on a concise manual on Islamic faith, worship and ethics called ''The Big Book of Islamic Catechism'' (''Büyük İslâm İlmihali'').
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