United States nationality law details the conditions in which a person holds United States nationality. In the United States, nationality is typically obtained through provisions in the U.S. Constitution, various laws, and international agreements. Citizenship is established as a right under the Constitution, not as a privilege, for those born in the United States under its jurisdiction and those who have been "naturalized". While domestic documents often use the words citizenship and nationality interchangeably, nationality is a broader term that refers to national identity and formal membership in a nation, while citizen is reserved to nationals who have the recognized status of citizenship.

Nationality is the legal status of belonging to a particular nation, defined as a group of people organized in one country, under one legal jurisdiction, or as a group of people who are united on the basis of culture.