Woronora is a suburb in southern Sydney, in the state of New South Wales, Australia. Woronora is located 27 kilometres south of the Sydney central business district, in the local government area of the Sutherland Shire.

'Woronora' is an Aboriginal placename. Records show the spelling of the name has varied since it first appeared in the 19th century, the earliest being Wooloonora (Dixon, 1827), followed by Wolonora (Dixon, 1837), and Woronora (Mitchell, 1835). The name was first applied to the Woronora River, a tributary of the Georges River, before being given to a hundred, an electoral district, a local road east of the river, and finally to the suburb itself.

The following meanings have been suggested for Woronora:
'black rock' (Appleton and Appleton 1992)
'black rocks' (Walker 1974; Neve 1970)
'river-of-no-sharks' (Bolton 2000)

Variations such as 'black cliffs' and 'sharkless waters' have also been suggested by local residents.