Casula is a western suburb of Sydney, located 26 kilometres south-west of the CBD in the local government area of the City of Liverpool. It is part of the Greater Western Sydney region.
Casula is bounded by Cowpasture Road and The Horsley Drive to the north, Elizabeth Drive to the east, Moorebank Avenue to the south and Heathcote Road to the west.
The suburb takes its name from Casula railway station, which was named after an early property owner in the area