Lakhdar Boumediene (Arabic: لخضر بومدين; born April 27, 1966) is an Algerian-born citizen of Bosnia and Herzegovina who was held in military custody in the United States Guantanamo Bay detention camps in Cuba beginning in January 2002.

He and four other of the Algerian Six plaintiffs were released from Guantánamo on May 15, 2009, after a US Federal judge found that "the Bush administration relied on insufficient evidence to imprison them indefinitely as 'enemy combatants.

It also had an office in Sarajevo and, at the request of his employer, Boumediene moved with his family to Bosnia, where he served as director of humanitarian aid for children who had lost relatives during the Yugoslav Wars.

At their request, Bosnia arrested Bensayah Belkacem, the man they believed had made dozens of phone calls to Afghanistan and Pakistan, and five acquaintances of his, including Boumediene.

In the summer of 2004, the Algerian Six filed suit against the US government with the help of the Center for Constitutional Rights and a team from Wilmer Cutler Pickering Hale and Dorr, challenging their detention without charges and claiming the protection of habeas corpus.

On November 20, 2008, U.S. District Judge Richard J. Leon ordered the release of Lakhdar Boumediene and four of the Algerian Six based on lack of sufficient evidence.

[10] On January 29, 2021, the New York Review of Books published an open letter from Boumediene, and six other individuals who were formerly held in Guantanamo, to newly inaugurated President Biden, appealing to him to close the detention camp.