International law is no longer merely “out there” somewhere, relevant only to travelers, merchants and diplomats. Quite the contrary. International law is being globalized, and ‘glocalized,’ so that it now covers complex contested areas such as civil unions, health insurance, sexual orientation, migration. This is an introduction to the fundamentals of twenty-first century international law. Subjects to be engaged include: human rights, environment, migration, family, culture, violence, and security. No prior work in the subject is needed.