| HISC | Hagar Industrial Systems Company
| Others |
| HISC | Hawaii Invasive Species Council
| Others |
| HISC | Hayling Island Sailing Club
| Others |
| HISC | HCSC Insurance Services Company
| Others |
| HISC | Health Insurance Study Committee
| Others |
| HISC | Healthcare Innovation Steering Committee
| Others |
| HISC | High Intensity Separation Conveyor
| Others |
| HISC | Hillsboro Inlet Sailing Club
| Others |
| HISC | Home Instead Senior Care
| Others |
| HISC | Horticultural Institute of Southern California
| Others |
| HISC | House Internal Security Committee
| Others |
| HISC | Hunter Ice Skating Club
| Others |
| HISC | Hydrogen Induced Stress Cracking
| Others |