Şehzade Ertuğrul Osman
| Ertuğrul Osman | |
|---|---|
| His Imperial Highness The Prince (Şehzade) of Ottoman Empire | |
| Head of the Osmanoğlu family | |
| Term | 12 March 1994 – 23 September 2009 |
| Predecessor | Şehzade Mehmed Orhan |
| Successor | Şehzade Bayezid Osman |
| Born | 18 August 1912 Nişantaşı Palace, Istanbul, Ottoman Empire |
| Died | 23 September 2009 (aged 97) Istanbul, Turkey |
| Spouse | Gulda Twerskoy Zeynep Tarzi |
| House | Ottoman Dynasty |
| Father | Şehzade Mehmed Burhaneddin |
| Mother | Aliye Melek Nazlıyar Hanım |
Şehzade Ertuğrul Osman Efendi (Ottoman Turkish: ارطغرل عثمان), also known as Osman Ertuğrul Osmanoğlu with a surname as required by the Turkish Republic (18 August 1912 – 23 September 2009), 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".