The sixth form is the final stage in British secondary schools. This term is used in England, Northern Ireland, Wales and some other Commonwealth countries. The sixth form (or 'Key Stage 5') is the final two years of secondary education (U.S. 'high school'). Students (typically between 16 and 18 years of age) prepare for their A-level (or equivalent) examinations.
- The term sixth form college is used by schools which only take 16 to 19 year old for advanced school-level qualifications. They may offer courses for the International Baccalaureate Diploma as well as Advanced level exams.
- In Scotland, the final year of school is known as sixth year or S6. Independent schools in Scotland often use the term "sixth form".