Thornleigh is a suburb of Sydney, in the state of
New South Wales, Australia 25 kilometres (16 mi)
north-west of the Sydney central business district
in the local government area of Hornsby
Shire. Thornleigh is bounded to the north by
Waitara Creek. Thornleigh borders the suburbs of
Normanhurst, Westleigh, Hornsby, Wahroonga
and Pennant Hills. Thornleigh is considered part of
the Northern Suburbs of Sydney.

Thornleigh offers great district views and the
topography varies greatly with many properties
built around bushland settings and into the hills to
afford the great views.