Mustafa Osman Ismail (born 1955 in Dongola, Sudan) is a former Sudanese politician. Ismail was the foreign minister of Sudan from 18 February 1998 to 18 September 2005.His main job as foreign minister was to be the government's main spokesman in diplomatic efforts to solve the Sudanese civil wars. He was the longest-serving foreign minister in Sudanese history. He was replaced by southerner Lam Akol when the national unity government took office.