The Australian Education Union (AEU) is an Australian trade union, founded in 1984 as the Australian Teachers Union, which is registered with Fair Work Australia as an employee group, and is affiliated with the Australian Council of Trade Unions. The AEU is Australia's third largest trade union, with 198,480 registered members in 2021, consisting of educators who work in public schools, colleges, early childhood and vocational settings in all states and territories of Australia. Members include teachers and allied educational staff, principals and administrators mainly in government school and TAFE systems. Teachers working in the private schools system are covered by the Independent Education Union of Australia (IEU). In some states the AEU shares coverage of some members with the National Tertiary Education Union, Community and Public Sector Union and United Workers Union. Through the Federation of Education Unions, the AEU works closely with the two other Federal unions which cover educators in non-government schools and universities. The AEU is also internationally affiliated to the Education International, which the AEU claims is "the largest non-government organisation in the world."