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| Season Number: | 4 |
| Starring: | Engin Altan Düzyatan Esra Bilgiç Cengiz Coşkun Cemal Hünal |
| Num Episodes: | 30 |
| Network: | TRT 1 |
The fourth season of the Turkish TV series, Diriliş: Ertuğrul, created by Mehmet Bozdağ, succeeds the third season and precedes the fifth and final season of . The fourth season of the historical drama television series premiered on 25 October 2017 and concluded on 6 June 2018.
It is believed that Ertuğrul is dead despite the truth being that he is actually captured by some slave traders. Meanwhile, Emir Sadettin convinces Dündar, Ertuğrul's brother and the new Kayı Bey, into selling Hanlı Pazar and moving back to Gündoğdu's tribe but is stopped upon Ertuğrul's return and is forthwith banished. After Ertuğrul's son, Gündüz, is kidnapped, Ertuğrul declares war against Karacahisar and is successful in conquering it. Following Ares' capture, Ertuğrul takes him to the Sultan and tells him to confess to the Sultan about Sadettin Köpek's misdeeds. The plan nearly works but Köpek is saved by the Sultan's wife, Mahperi Hatun and leads to an event turning Tekfur Ares, later killed by Noyan, into a Muslim. Soon after that, the Sultan is killed and Köpek's increase in power in the palace creates problems for the new Sultan, Gıyaseddin. Gıyaseddin allies with Ertuğrul and with the help of Hüsamettin Karaca, Köpek is beheaded. After this, Ertuğrul faces the return of Noyan but is successful in defeating him and his devious sister, Alangoya, who attempted to kill Ertuğrul's son, Osman, who was born on the same day as his mother's death. Noyan prepares for a battle, historically known as the Battle of Köse Dağ and the Kayı move to Söğüt.
See also: List of Diriliş: Ertuğrul characters.
See also: List of Diriliş: Ertuğrul episodes.