Kalman Taigman also Teigman Hebrew: קלמן טייגמן (c. 24 December 1923 – c. 27 July 2012) was an Israeli citizen who was born and grew up in Warsaw, Poland.

[1][2] One of the former members of the Jewish Sonderkommando who escaped from the Treblinka extermination camp during the prisoner uprising of August 1943,[2][citation needed] Taigman later testified at the 1961 Eichmann Trial held in Jerusalem.

In 1935, his father emigrated to Mandate Palestine intending to arrange for the family to join him, but the war broke out and he was unable to achieve that.

[citation needed] For a number of years in Israel, Taigman used to meet with other Holocaust survivors on the anniversary of the Treblinka uprising.

Among the guests at the home of his friends Samuel (Szmuel) Willenberg and his wife Ada were Pinhas (Pinchas) Epstein and Eliahu Rosenberg.

[2] Later both Rosenberg and Epstein were star witnesses for the Israeli prosecution at the 1986–88 trial in Israel of John Demjanjuk, who had been living in the United States since 1952.

He was identified as a Trawnkiki camp guard, who drawn from Soviet POWs held by the Germans, who had been nicknamed "Ivan the Terrible" by Treblinka prisoners.

A guard at the gas chamber, "Ivan" was accused of committing murder and acts of extraordinary cruelty and violence at Treblinka against the Jewish prisoners in 1942–43.

Investigators discovered in those Soviet-held archives that Demjanjuk appeared to have served at Sobibor SS death camp, according to an ID with his photo.