Blood purity

{{Wiktionary|pureblood|pureblooded|full-blooded|half blood|half-blooded}}

Blood purity and related terms such as full blood or half-blood may refer to:

• Blood purity, a fictional concept of wizarding ancestry in the Harry Potter series
• Blood quantum laws, tribal laws in the United States defining Native American status
• Full-blood, a deprecated term used in the past to denote proportional representation of Aboriginality in Australia, along with terms such as "half-caste"
• Limpieza de sangre, blood purity laws in Medieval Spain stipulating a social hierarchy based on ancestry
• Pureblood, a term used in COVID-19 anti-vaccine activism to denote people who have not been vaccinated
• Racial hygiene, an approach to eugenics in the early 20th century especially by Nazi Germany