Wollondilly is an electoral district of the Legislative Assembly in the Australian state of New South Wales.

It is currently represented by independent Judy Hannan, who defeated sitting member Nathaniel Smith at the 2023 New South Wales state election.

Both Premiers Tom Lewis and George Fuller held Wollondilly while in office, the other three electorates being Ku-ring-gai, Maroubra and Willoughby.

Wollondilly was recreated for the 2007 state election, covering areas previously belonging to the districts of Campbelltown, Camden and Southern Highlands, the last of which was abolished.

[3] It encompassed all of Wollondilly Shire (including Picton, Tahmoor, Bargo, Yanderra, Thirlmere, Buxton, Wilton, Appin, Douglas Park, Menangle, Cawdor, The Oaks, Oakdale, Warragamba and Silverdale) and part of the City of Campbelltown (including Ambarvale, Glen Alpine, some of Bradbury, St Helens Park, Rosemeadow, Gilead, Wedderburn and Menangle Park).