The Illawarra Business Chamber works closely with a range of other business associations across the Illawarra. The IBC has an affiliation program with the following local Chambers of Commerce.
- Southern Highlands Business Chamber
- Shoalhaven Business Chamber
- Junior Chamber International (JCI) Illawarra
- Corrimal Chamber of Commerce
- Kiama Chamber of Commerce
- Port Kembla Chamber of Commerce
- Northern Illawarra Chamber of Commerce