Armidale High School was a government-funded co-educational comprehensive secondary day school, located in Armidale, a university city in the New England region of northern New South Wales, Australia.

The establishment of the Armidale Teachers' College (1928) and then the New England University College (1938), now the University of New England, drew teachers to Armidale for career reasons and helped create a vibrant sporting and academic culture.

The school expanded quickly over the 1950s and 1960s as the expansion of the university brought new families to the city.

Structural changes in Australian higher education resulting from the Dawkins Education Reforms from the late 1980s lead to significant job losses in Armidale, population decline and hence declines in student numbers at the two high schools.

In 2018 it was announced that Armidale High would merge with Duval High to form the newly established Armidale Secondary College that will cater for approximately 1,500 students from Year 7 to Year 12.