The white genocide, white extinction, or white replacement conspiracy theory is a white supremacist conspiracy theory that claims there is a deliberate plot to cause the extinction of whites through forced assimilation, mass immigration, and/or violent genocide. It purports that this goal is advanced through the promotion of miscegenation, interracial marriage, mass non-white immigration, racial integration, low fertility rates, abortion, pornography, LGBT identities, governmental land-confiscation from whites, organised violence, and eliminationism in majority white countries. Under some theories, Black people, Hispanics, and Muslims are blamed for the secret plot, but usually as more fertile immigrants, invaders, or violent aggressors, rather than as the masterminds. A related, but distinct, conspiracy theory is the Great Replacement theory.

Renaud Camus is a French novelist, conspiracy theorist, and white nationalist writer. He is the inventor of the "Great Replacement", a far-right conspiracy theory that claims that a "global elite" is colluding against the white population of Europe to replace them with non-European peoples.