Ahmed I (Ottoman Turkish: احمد اول‎ Aḥmed-i evvel; Turkish: I. Ahmed; April 18, 1590 – November 22, 1617) was the Sultan of the Ottoman Empire from 1603 until his death in 1617. Ahmed's reign is noteworthy for marking the end of the Ottoman tradition of royal fratricide; henceforth Ottoman rulers would no longer execute their brothers upon accession to the throne. He is also well known for his construction of the Blue Mosque, one of the most famous mosques in Turkey.

Ahmed was born on 18 April 1590 at the Manisa Palace, Manisa, when his father Şehzade Mehmed was still a prince and the governor of the Sanjak of Manisa. His mother was Handan Sultan. After his grandfather Murad III's death in 1595, his father came to Istanbul and ascended the throne as Sultan Mehmed III. His father ordered the execution of nineteen of his brothers and half brothers. His elder brother Şehzade Mahmud was also executed by his own father on 7 June 1603, just before his own death on 22 December 1603. Mahmud was buried along with his mother in a separate mausoleum built by Ahmed in Şehzade Mosque, Istanbul.

Ahmed ascended the throne after his father's death in 1603. When ascended the throne, his powerful grandmother Safiye Sultan was still alive. He broke with the traditional fratricide and sent his brother Mustafa to live at the old palace at Bayezit along with their grandmother Safiye Sultan. A far lost uncle of Ahmed, Yahya, resented his accession to the Ottoman throne in 1603, and spent his life scheming to become Sultan.

In contrast to previous enthronements, Ahmed did not order the execution of his brother Mustafa, thus the Ottoman tradition of royal fratricide was brought to an end. This was most likely due to Ahmed's young age - he had not yet demonstrated his ability to sire children, and Mustafa was then the only other candidate for the Ottoman throne. His brother's execution would have endangered the dynasty, and thus he was spared.

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