Bailup is a Western Australian locality and rural residential estate located 62 kilometres (39 mi) northeast of the state capital, Perth, along Toodyay Road.

Bailup was named after a nearby creek and a police station and inn established on Toodyay Road in the 1840s.

[4] Most of the locality is covered in open jarrah, marri and wandoo woodland, with some areas of dense understorey vegetation.

Nearby Morangup Hill (31°39′31″S 116°18′55″E / 31.65861°S 116.31528°E / -31.65861; 116.31528), the main feature of a reserve managed by the Department of Environment and Conservation (DEC) on the edge of the Avon Valley National Park, is a granite peak providing extensive views over the surrounding area and is home to several species of birds including the square-tailed kite.

[5] The Red Swamp Brook, which runs through Bailup, feeds a significant wetland area.