Perth Modern School is a public co-educational academically selective high school, located in Subiaco, an inner city suburb of Perth, Western Australia. Perth Modern is Western Australia's only fully academically selective public school. Established in 1911, the school is both the oldest public high school and the oldest co-educational high school in Western Australia (WA).

Subiaco is an inner-western suburb of Perth, the capital of Western Australia. It is approximately 3 km (1.9 mi) west of Perth's central business district, in the City of Subiaco local government area. Historically a working-class suburb containing a mixture of industrial and commercial land uses, since the 1990s the area has been one of Australia's most celebrated urban redevelopment projects. It remains a predominantly low-rise, urban village neighbourhood centred around Subiaco train station and Rokeby Road.