Jilliby ( ) is a large rural locality with farms and bushland that is located in the Dooralong Valley of the Central Coast region of New South Wales, Australia. It is part of the local government area.
In the 2016 Census, there were 1,646 people in Jilliby. 83.1% of people were born in Australia and 91.2% of people spoke only Australian English at home. The most common responses for religion were Catholic (25.7%), Anglican (24.2%) and No Religion (22.9%).