Antinatalism or anti-natalism is a family of philosophical views that are critical of reproduction — they consider coming into existence as bad or deem procreation as immoral. Antinatalists thus argue that humans should abstain from having children. Antinatalist views are not necessarily limited only to humans but may encompass all sentient creatures, arguing that coming into existence is a harm for sentient beings in general.

Natalism is an ideology that promotes the reproduction of human life as an important objective of being human and advocates high birthrate. According to the Merriam-Webster dictionary, the term, as it relates to the belief itself, dates from 1971 and comes from French: nataliste, formed from French: natalité, birthrate.