George Mantello (born György Mandl; 11 December 1901 – 25 April 1992), a businessman with various diplomatic activities, born into a Jewish family from Transylvania, helped save thousands of Hungarian Jews from the Holocaust while working for the Salvadoran consulate in Geneva, Switzerland from 1942 to 1945 under the protection of consul Castellanos Contreras, by providing them with fictive Salvadoran citizenship papers.

He publicized in mid-1944 the deportation of Hungarian Jews to the Auschwitz-Birkenau death camp, which had great impact on rescue, rapidly led to unprecedented large-scale grass root protests by the Swiss people and church, which was a major contributing factor to Hungary's regent Miklós Horthy stopping the transports to Auschwitz.

David Kranzler writes that his paternal grandfather was a rabbi, R. Yitzchok Yaakov Mandl, that his father owned a mill, and that the family was regarded as well-to-do.

The lull in deportations made it possible to organize significant rescue activities in Hungary, such as the Raoul Wallenberg mission and continued protection of Jews by Carl Lutz.

[6] Nota bene: the fact that György Mandl/George Mantello was Jewish made him ineligible for the title "Righteous Among the Nations" conferred by Israel to non-Jews who saved Jews during the Holocaust.