Şehzade Ertuğrul Osman Efendi (Ottoman Turkish: ارطغرل عثمان; 18 August 1912 – 23 September 2009), also known as Osman Ertuğrul Osmanoğlu with a surname as required by the Turkish Republic, was a prince of the Ottoman Empire and the 43rd Head of the Imperial House of Osman from 1994 until his death.
Until the abolition of the monarchy on 1 November 1922, Osman was addressed as His Imperial Highness Şehzade Ertuğrul Osman Efendi Hazretleri, Imperial Prince of the Ottoman Empire. He is known in Turkey as "the last Ottoman".
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