D eniz Sahenk is a Turkish billionaire and the matriarch of the Sahenk family, one of the wealthiest and most influential families in Turkey. She is the widow of Ayhan Sahenk, the founder of the Dogus Group, a massive Turkish conglomerate. Upon her husband's death in 2001, she and her two children, Ferit and Filiz, inherited his vast business empire.

While her son, Ferit Sahenk, has served as the chairman and public face of the Dogus Group, Deniz has been a key figure behind the scenes as a major shareholder and the head of the family's philanthropic arm, the Ayhan Sahenk Foundation. The Dogus Group has extensive and diversified interests in financial services (including the prominent Garanti Bank, in which they sold their remaining stake), automotive, construction, media, and high-end hospitality. Her wealth is derived from her inherited stake in this powerful and enduring Turkish family conglomerate.