List of conspiracy theories

There are many unproven conspiracy theories of varying degrees of popularity, frequently related to but not limited to clandestine government plans, elaborate murder plots, suppression of secret technology and knowledge, and other supposed schemes behind certain political, cultural, and historical events. Some theories have dealt with censorship and excoriation from the law such as the Holocaust denial. Conspiracy theories usually go against a consensus or cannot be proven using the historical method and are typically not considered similar to verified conspiracies such as Germany's pretense for invading Poland in World War II.

Ethnicity, race and religion

Antisemitic conspiracy theories

Antisemitism has, from the Middle Ages, frequently taken on characteristics of conspiracy theory. Antisemitic canards continue to circulate. In medieval Europe it was widely believed that Jews poisoned wells, had killed Jesus, and consumed the blood of Christians in their rituals (despite the fact that human and animal blood are not kosher).