Undercliffe is an area in the east of the suburb of
Earlwood in south-western Sydney, in the state of
New South Wales, Australia. Undercliffe is located
10 kilometres south-west of the Sydney central
business district in the local government area of
the Canterbury-Bankstown Council.

Undercliffe is a predominantly residential area.
The northern end of the peninsula is characterised
by parkland and recreational areas.
The popular Cooks River bicycle track follows the
river along its northern bank connecting the
suburb with Homebush to the north-west and
Botany Bay to the east.