Mansur Ahmad Saad al-Dayfi (born 1979) is a Yemeni who was held without charge in the United States Guantanamo Bay detention camps in Cuba from February 9, 2002, to July 11, 2016.

[9][10][11] Originally the Bush Presidency asserted that captives apprehended in the "war on terror" were not covered by the Geneva Conventions, and could be held indefinitely, without charge, and without an open and transparent review of the justifications for their detention.

Jacob said that neither Serbia nor the US had provided him with any language training, or other support to help him adapt to civilian life, or adjust to living in a foreign culture, or help him find employment, and that he had started a hunger strike in consequence.

[23][24] On January 29, 2021 the New York Review of Books published an open letter from al-Dayfi and six other individuals who were formerly held in Guantanamo to newly inaugurated US president Joe Biden, appealing to him to close the detention camp.

[25] In a November 2022 interview, al-Dayfi stated that current Florida governor Ron DeSantis, during his time as a JAG lawyer at Guantanamo Bay detention camp, oversaw beatings and force-feedings of detainees.