Some of Sinclair Services clients are:
- Australian Earthquake Engineering Society
- Berwick Football Club
- Cabinet Makers Insurance Brokers
- Cranbourne Football Club
- David Sauer, Chartered Accountant
- DNA Solutions
- Hamilton & Hamilton Insurance Brokers
- IT Claims Services
- KTA 4WD Training
- MCA Insurance Brokers
- PSB Insurance Brokers
- Sear Insurance Brokers
- Tax Plus
- Victorian Indonesian Language Teachers Association
Sinclair Services also provides pro bono IT services for these not-for-profit organisations: