Feodor Fedorenko or Fyodor Federenko was a Soviet Nazi collaborator and war criminal who served at Treblinka extermination camp in German occupied Poland during World War II. As a former Soviet citizen admitted to the United States under a DPA visa (1949), Fedorenko became a naturalized U.S. citizen in 1970. His prior Nazi collaboration was discovered in 1977, leading to his denaturalization in 1981. Subsequently, he was deported to the USSR and sentenced to death for treason and participating in the Holocaust. Fedorenko was executed in 1987.

Treblinka was the second-deadliest extermination camp to be built and operated by Nazi Germany in occupied Poland during World War II. It was in a forest north-east of Warsaw, 4 km (2.5 mi) south of the village of Treblinka in what is now the Masovian Voivodeship. The camp operated between 23 July 1942 and 19 October 1943 as part of Operation Reinhard, the deadliest phase of the Final Solution. During this time, it is estimated that between 700,000 and 900,000 Jews were murdered in its gas chambers, along with 2,000 Romani people. More Jews were murdered at Treblinka than at any other Nazi extermination camp apart from Auschwitz-Birkenau.