Harun Osman Osmanoğlu is the grandson of which Ottoman sultan?

The Osmanoğlu family are the members of the historical House of Osman (the Ottoman dynasty), which was the namesake and sole ruling house of the Ottoman Empire from 1299 until the establishment of the Republic of Turkey in 1923.

There were 36 Ottoman sultans who ruled over the Empire, and each one was a direct descendant through the male line of the first Ottoman Sultan, Sultan Osman I. After the deposition of the last Sultan, Mehmed VI, in 1922, and the subsequent abolition of the Ottoman Caliphate in 1924, members of the Imperial family were forced into exile. Their descendants now live in many countries throughout Europe, as well as in the United States, the Middle East.

Harun Osman Osmanoğlu (born 22 January 1932) is the current Head of the House of Osman.

Osman's father was Şehzade Mehmed Abdülkerim, the only son of Şehzade Mehmed Selim, the eldest son of Abdul Hamid II. In 1924, when members of the Ottoman dynasty were expelled, they left to Beirut. Mehmed Abdülkerim died in 1935 in Damascus and left his two children, born in 1930 and 1932 orphans at a young age. Osman's grandfather Mehmed Selim died in 1937. The family returned to Istanbul from exile in Damascus in 1974, just after the dynasty members were allowed to return to their homeland. Osman became the Head of the Ottoman dynasty in 2021 upon the death of his older brother, Dündar Osmanoğlu. He lives in Istanbul and has nine grandchildren