Abdullahi Yusuf Ahmed (Somali: Cabdulaahi Yuusuf Axmed, Arabic: عبدالله يوسف أحمد; 15 December 1934 – 23 March 2012), was a Somali politician and former military official who served as the first President of Puntland from 1998 to 2004. He also played a key role in establishing the Transitional Federal Government (TFG), which he led as President of Somalia from 2004 to 2008. Additionally, he was one of the founders of the rebel Somali Salvation Democratic Front (SSDF).
Yusuf was a career soldier in the Somali National Army, participating in the 1964 Border War and Ogaden War against Ethiopia. After Somalia's defeat in the Ogaden War in 1978, he led a failed coup against President Siad Barre, marking the start of the Somali rebellion. Following the coup's failure, Yusuf established the Somali Salvation Democratic Front in Ethiopia and began fighting alongside Ethiopian forces against the Somali army. During the 1982 Ethiopian-Somali War, he led SSDF forces. Frustrated by the operation's failure and the SSDF's surrender to the Somali government, the Ethiopians jailed Yusuf until the Derg regime collapsed in 1991.