Ali I of Yejju (died 18 June 1788) was a Ras of Begemder, and following the death of Ras Mikael Sehul, Regent of the Emperor of Ethiopia. He was the son of Abba Seru Gwangul, chieftain of the Yejju, and Woizero Gelebu Faris, daughter of Ras Faris of Lasta.
According to Abir, he founded the town of Debre Tabor, which became the capital of his dynasty. However, from the accounts in the Royal chronicle Ali is never mentioned as dwelling at Debre Tabor, instead he is more closely tied to Filakit Gereger (called Garagara in the Royal chronicle).
One of the first steps in the advancement of Ali's career came in August 1781 when the Emperor Tekle Giyorgis I summoned him to his court and made him Balambaras. Two years later, while still a Balambaras he took part in the Emperor's abortive march on Shewa, which failed to cross the Checheho River. Ten months later, Ali joined Ras Haile Yosadiq and together conspired to depose the emperor, defeating him at Afarwanat, after which Tekle Giyorgis fled into exile at Amba Sel. Subsequently, the two nobles brought Iyasu Atsequ down from Wehni and made him Emperor 18 February 1784; in return, Ali was promoted to Dejazmach.
Ali took several steps to consolidate his position and prepare his way to the next rank of power, Ras Betowedded. One was to offer his niece Anqualit to the influential Dejazmach Hailu Eshte of Begemder. This alliance led to conflict between Ali and his former ally Ras Haile Yosadiq, and to Ali's decision to recall the Emperor Tekle Haymanot from exile in 1786 and restored him to power; in response, Ras Haile Yosadiq prudently provided a refuge to the deposed Emperor Iyasu in Gojjam. Another one was the systematic capture of the ambas of Balambaras Ramkha, which ended with the Balambaras' death in the sack of his base at Limon. Shortly after this, Ali was released from the excommunication that had been placed on him, and kept the feast of St. Gabriel the Archangel. A third step, which was not unique to Ali but taken by many of the warlords of the time, was to dissolve or reorganize the existing military units and create new ones, and granting them lands to support the soldiers. This would make the soldiers dependent on the warlord for their livings, not the Emperor.