Osman IV (Os̱mân Ömer Nestur Çoḫân ben Bâyezîd ben Erṭoğrıl ebû Orhan Os̱mânoğlu; born 28 January 1970) is the Şâhenşâh of the Ottoman Empire. He ascended to the throne on 2017 upon the death of his father.
Osman was born in the Imperial Palace of Nebuchadnezzar (Iraki: Serây-i Nebûḫâtneṣṣâr), located in the Karḫa district in the Iraki capital, Bağdad. He was the second child and first son of his father Bayezid III and his mother, Queen Empress Zeînifelek Gülezibâ Kocabaṣı. He became Veliaht-i Şâhenşâhlık upon his father's accession as Şâhenşâh on 13 June 2009 and succeeded him following his death on 14 October 2017. He went to private primary, secondary and tertiary schools in Irak and attended the Imperial University of Gondēšāpūr in Persia, as well as the Pandidaktḗrion in Constantinople, graduating with a degree in Law and a Master in Economic Law, respectively. He married Kadınefendi Nakşidil Yıldız in 1993, and they have seven children: Princess Mihrümah (born 1994), Veliaht-i Şâhenşâhlık Orhan (born 1996), twins Prince Çihangir and Princess Raziye (born 1997), Princess Melisa (born 1999), Prince Rüstem (born 2001) and Princess Bezmiâlem (born 2004).
Osman is interested in sports, such as chariot racing, bullfighting and football, and religious affairs. Until his accession to the throne, he was a member of the Imperial Chariot-Racing Committee and the Grandmaster of the secular branch of the Order of Mârs̱adai. He is a supporter of the Red Charioteer Club of Baghdad (Iraki: Kızıl Arabacıları-ye Bağdad'ın) and of the Yunansêray Football Club.