The Eichmann trial was the 1961 trial of major Holocaust perpetrator Adolf Eichmann who was captured in Argentina by Israeli agents and taken to Israel to stand trial. Eichmann was a senior Nazi party member and served at the rank of Obersturmbannführer in the SS, and was primarily responsible for the implementation of the Final Solution. He was responsible for shipping Jews and other people from across Europe to the concentration camps, even managing the shipments to Hungary directly, where 564,000 Jews died. After the end of World War II, he fled to Argentina, living under a pseudonym until his capture in 1960 by Mossad.

Eichmann was charged with fifteen counts of violating the Nazis and Nazi Collaborators (Punishment) Law. His trial began on 11 April 1961 and was presided over by three judges: Moshe Landau, Benjamin Halevy, and Yitzhak Raveh. He was convicted on all fifteen counts and sentenced to death. He appealed his conviction to the Israeli Supreme Court, which confirmed the convictions and the sentence.

President Yitzhak Ben-Zvi rejected Eichmann's request to commute the sentence and he was hanged on 1 June 1962 at Ramla Prison.

Eichmann was a high-ranking SS official who played a key role in planning and executing the Holocaust. As head of Section IV-B-4 of the Reich Security Main Office (RHSA) under Reinhard Heydrich, Eichmann was in charge of Jewish affairs and deportations. He organized the forced removal of hundreds of thousands of Jews from Germany and occupied parts of Europe, arranging transport trains to ghettos and extermination camps as part of the Final Solution. Eichmann coordinated with other Nazi officials to ensure the systematic deportation and murder of Jews, and was deeply involved in operations such as the deportation of 440,000 Hungarian Jews to Auschwitz in 1944.

As the Second World War was ending in Europe, Eichmann fled as the Third Reich collapsed. He was captured by American forces in 1945, but managed to hide his identity using false papers and escaped from an American detention camp in 1946. For several years he lived under aliases in Germany and avoided the trials associated with denazification. In 1950, with assistance from a network that helped fugitive Nazis, Eichmann secured an Argentine visa and a Red Cross passport under the name Ricardo Klement, fleeing Europe for South America. Settling in Argentina, he was later joined by his wife and children and lived a low-profile life working various jobs, including at a Mercedes-Benz factory in Buenos Aires, all while concealing his true identity. Among the German expatriate community, it eventually became an open secret that the individual known as Klement was in fact Eichmann. During this period, he showed little to no remorse for his actions; he even gave interviews to pro-Nazi acquaintances, reportedly boasting that "not having murdered all the Jews" was his only regret.

Meanwhile, an international manhunt was underway in Europe. Pursued persistently by war-crimes investigators and Nazi hunters like Simon Wiesenthal, Eichmann's name had surfaced during the Nuremberg trials but his whereabouts were unknown. In the mid-1950s, clues and rumors suggested he was hiding in Argentina. In 1957, Fritz Bauer, the Attorney General of the German state of Hesse and himself a Jewish holocaust survivor, secretly informed Israeli agents that Eichmann was living in Buenos Aires under the name Ricardo Klement. Bauer acted covertly due to fear that people in West Germany would potentially tip off Eichmann if official channels had been used instead. His tip, corroborated by information from a German expatriate and Holocaust survivor in Argentina, gave Mossad critical leads that set them on Eichmann's trail. Notably, it later emerged that the West German intelligence service (BND) and the Central Intelligence Agency had also learned his location by 1958, but chose not to pursue him or alert Israel. Cold War considerations and the presence of ex-Nazis as informants contributed to their reluctance – an embarrassment that was acknowledged decades later when these facts came to light. Ultimately, it was the persistence of individuals like Bauer, Herrmann, and Wiesenthal, combined with Israel's resolve, that led to Eichmann's discovery.

By 1960, Mossad had confirmation of Eichmann's whereabouts in the suburbs of Buenos Aires. Israeli Prime Minister David Ben-Gurion, aware that formal extradition to Israel was unlikely (Argentina had a record of refusing to hand over Nazi fugitives) approved a covert operation to capture Eichmann. In May 1960, a Mossad team led by agent Rafi Eitan and orchestrated by director Isser Harel set up surveillance and prepared an elaborate abduction plan.

Ten people were put to the task, including a disguise expert, a doctor, a document forger, a melee specialist and Harel himself. One of the agents was a survivor of Auschwitz where his parents were sent to the gas chamber. "We have not only the right, but also a moral duty to bring this man to justice [...] We are embarking on a historic journey. It goes without saying that this is no ordinary task. We must arrest the man who has the blood of our people on his hands," said Harel.