Prisoner X may refer to:

Placeholder name for prisoners

* Ben Zygier, held in Ayalon Prison in Israel until his death there in 2010 **Ali-Reza Asgari, incorrectly asserted to be Prisoner X by the Tikun Olam blog * Avri Elad (died 1993), the "third man" or "X" in the

Lavon Affair The Lavon affair was a failed Israeli covert operation, codenamed Operation Susannah, conducted in Egypt in the summer of 1954. As part of a false flag operation, a group of Egyptian Jews were recruited by Israeli military intelligence to pla ...

, held in Ayalon Prison *

Marcus Klingberg Avraham Marek Klingberg (7 October 1918 – 30 November 2015), known as Marcus Klingberg (), was a Polish-born Israeli epidemiologist and the highest ranking Soviet spy ever uncovered in Israel. Klingberg made major contributions in the fields o ...

, held from 1983 to 2003 in Israel *

Prisoner X2 "Prisoner X2" (Hebrew: or ) is a placeholder name of a Mossad agent (described as an "important operative") who has reportedly been secretly imprisoned in Israel since about 2004, after he was convicted of treason (reportedly spying for Iran). Re ...

, an unidentified prisoner held in Ayalon Prison from about 2004 until 2018 * Tomer Eiges, or "Officer X", died in military prison awaiting trial in 2021

Other uses

* ''Age of X-Man: Prisoner X'', a 2019 comic book, part of the ''

Age of X-Man ''Age of X-Man'' is a 2019 Marvel Comics crossover storyline featuring the X-Men. The name and premise derive from the 1995 storyline '' Age of Apocalypse'', but instead focus on a utopian alternate universe led by the X-Man, Nate Grey. Publicat ...

'' crossover * ''Prisoner X'', a 2015 Canadian film {{disambiguation Journalism lists Placeholder names