The Europe region is composed of:

Killers from the Europe region include:

King Léopold II of Belgium
Country: Belgium, Congo Free State
Kill tally details: Five to 15 million Congolese (the indigenous inhabitants of the Congo River basin)
Josef Mengele
Country: Germany
Kill tally: Less than 5,000
Kill tally details: Directly responsible for the deaths of thousands at Auschwitz concentration camp
Slobodan Milosevic
Country: Serbia
Kill tally: 100,000 to 500,000
Kill tally details: Up to 230,000 killed and three million displaced
Ratko Mladic
Country: Bosnia-Herzegovina
Kill tally: 100,000 to 500,000
Kill tally details: Up to 200,000
Benito Mussolini
Country: Italy
Kill tally: 100,000 to 500,000
Kill tally details: Over 400,000 Italians killed during the Second World War. At least 30,000 Ethiopians killed during the Italian occupation of Ethiopia
Ante Pavelic
Country: Croatia
Kill tally details: 300,000 to one million, including up to 30,000 Jews, up to 29,000 Gipsies, and between 300,000 and 600,000 Serbs
Joseph Stalin
Country: Soviet Union
Kill tally details: Approximately 20 million, including up to 14.5 million needlessly starved to death. At least one million executed for political "offences". At least 9.5 million more deported, exiled or imprisoned in work camps, with many of the estimated five million sent to the Gulag Archipelago never returning alive. Other estimates place the number of deported at 28 million, including 18 million sent to the Gulag