According to a 2013 study of the Srebrenica genocide, Geller “is among the most vociferous revisionists” of the genocide. She denies the genocide of Bosniaks in Srebrenica, describing it as the "Srebrenica Genocide Myth." She has defended Slobodan Milošević, who died while standing trial for war crimes in the Bosnian War, and denied the existence of Serbian concentration camps. She claimed that the 1999 NATO intervention in Kosovo was “in order to pave the way for an Islamic state in the heart of Europe—Kosovo.”