Casula is a suburb of Sydney, in the state of New South Wales, Australia. It is 34 kilometres south-west of the Sydney central thing district, in the local government Place of the City of Liverpool.
Casula is the first suburb unexpectedly south of Liverpool upon the Hume Highway and the Main Southern railway line along with Sydney and Melbourne. Casula consists of undulating, gently rolling land, with elevations across the suburb subconscious mostly together with 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.