Quaternary education or postgraduate education is the fourth-stage educational level which follows the completion of an undergraduate degree at a college or university. Graduate school is an example of quaternary education; some consider postdoctoral positions to be quaternary education while others consider them to be jobs.

In Australia, this term is normally not used. Postgraduate study is considered part of tertiary education.

See also

• Education by country
• Graduate student
• Higher education
• List of colleges and universities by country