Population reduction

The term population reduction may refer to:
 * Population decline or depopulation, reductions in human population levels for reasons such as low birth rate, emigration, disease or war
 * a euphemism for genocide, sometimes used by perpetrators of genocide to disguise their actions
 * Population control, artificially maintaining the size of any population
 * Culling, deliberate reductions in animal or plant population levels, by human action
 * the phase preceding the extinction of a species