Lucas Heights is a suburb in southern Sydney, in
the state of New South Wales, Australia. Lucas
Heights is located 31 kilometres south-west of the
Sydney central business district, in the local
government area of the Sutherland Shire. Lucas
Heights is located on the Woronora River, which
flows north into the Georges River.

Unusually for a suburb, Lucas Heights does not
contain a residential area. The residential area
previously part of Lucas Heights was renamed
Barden Ridge in 1996 to increase the real estate
value of the area, as it would no longer be instantly
associated with the HIFAR nuclear reactor.