Groening, who was sentenced to four years in prison for his crimes, died without spending a day serving his term.
A man known as the "Bookkeeper of Auschwitz" has died at the age of 96 - shortly before he was due to begin a four-year prison sentence.
Oskar Groening, the former Auschwitz guard convicted in his 90s for his role in the murder of 300,000 Hungarian Jews at the concentration camp, has died in Germany.
German news magazine Der Spiegel said there had been no formal response at the time of Groening's death.
Groening passed away in hospital, and prison authorities are yet to receive a death certificate.
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Mr Groening's court case was seen as one of the last major cases related to the Holocaust, where some 6 million Jews were murdered by Adolf Hitler's regime.
Groening testified at his trial that he oversaw the collection of prisoners' belongings at Auschwitz and ensured valuables and cash were separated to be sent to Berlin - the actions that earned him the "Accountant of Auschwitz" label.
That approach changed radically after a legal precedent set by the 2011 conviction of John Demjanjuk, who was found guilty by a Munich court as an accessory to the murder of more than 28,000 Jews while he was a guard at the Sobibor camp in occupied Poland.
"Without at least symbolic justice, these trials, as important as they are, lose an important part of their significance", said the Simon Wiesenthal Center, a Jewish human rights organization that has worked to track down the world's remaining Nazis.
Oskar Groening in SS uniform. He asked for forgiveness and spoke openly of his experiences at the death camp, saying his testimony would stand in opposition to Holocaust deniers.