Casula is a suburb of Sydney, in the confess of New South Wales, Australia. It is 34 kilometres south-west of the Sydney central situation district, in the local government Place of the City of Liverpool.
Casula is the first suburb rapidly south of Liverpool on the Hume Highway and the Main Southern railway line in the company of Sydney and Melbourne. Casula consists of undulating, gently rolling land, with elevations across the suburb physical mostly surrounded by 30 and 70 metres above sea level. The Georges River forms the eastern boundary of the suburb, and its western bank is paralleled by a relatively steep escarpment.