Siskinds serves a wide range of clients locally, provincially and nationally.
The following list is a representative example of the diversity of Siskinds clients:
| AgraTurf Equipment Services Inc | |
| Airia Group of Companies | |
| Alliance i Communications Inc. | |
| Autotube Limited | |
| Bank of Nova Scotia | |
| Bratton Consulting Inc. | |
| Buckland Customs Brokers Limited | |
| Capital Tool & Design Limited | |
| Chriselle Conference Management | |
| Deetag Ltd. | |
| Etymonic Design Inc. | |
| Fanshawe College | |
| Fiddick's Nursing Home Ltd. | |
| Glendale Recreational Vehicles | |
| Heritage Custom Cabinets | |
| Hohner Corp | |
| Interact Direct Marketing Inc. | |
| John P. Robarts Research Institute | |
| Kings College | |
| London Humane Society | |
| Lubrico Warranty Inc. | |
| M. L. Schram Inc. | |
| MarketForce Communications Inc. | |
| Nerds On Site | |
| Obsidian Group Inc. | |
| Ontario School Board's Insurance Exchange | |
| Phoenix Interative Design Inc. | |
| Spencer Steel | |
| Super Gard Canada Ltd. | |
| TDS Automotive | |
| The Info-Tech Research Group | |
| The Rent-2-Own Depot Inc. | |
| Timberland Equipment | |
| Town & Country Mutual Insurance Company | |
| TT Group Limited | |
| West Wawanosh Mutual Insurance Company | |
| Winmar Franchise Corp. | |
| Z Group | |
