Saad Eddin Ibrahim (Arabic: سعد الدين إبراهيم, IPA: [ˈsæʕd edˈdiːn ebɾˤɑˈhiːm]) (31 December 1938 – 29 September 2023) was an Egyptian sociologist and author.

He was a visiting professor at UCLA in Los Angeles in the spring of 1979, and on leave from AUC to serve as Secretary General of the Arab Thought Forum, chaired by Crown Prince Hassan of Jordan from 1984 to 1989.

Ibrahim was arrested, imprisoned and prosecuted in 2000 for using European Union funds for election monitoring, and for allegedly defaming Egypt's image abroad.

His defence team countered that the real motive behind the government's prosecution of Ibrahim and his assistants was his outspoken criticism of President Hosni Mubarak and his administration.

During a third trial before the highest civil court in 2003, he was cleared of all charges and released, but not before a storm of international protest had put the Mubarak regime on the defensive.

He was attacked in the official press for calling on the U.S. Congress to condition its military aid to Egypt on improvements in the country's human rights record and the freeing of political prisoners.

He returned permanently to Cairo on 12 February 2011, within hours of Mubarak's departure from office and to celebrate the short-lived fruits of the 25 January revolution.