| # | Company name | Role | # of projects |
|---|---|---|---|
| 61 | Hertzberg & Sanchez, PC | Consultancy | 25 |
| 62 | Hess Geotechnical Corp. | Consultancy | 0 |
| 63 | Hess, Roise & Company | Consultancy | 6 |
| 64 | Hesselberg Keesee And Associates Inc | Consultancy | 0 |
| 65 | Hibex BV | Consultancy | 17 |
| 66 | Hickton Consultants Limited | Consultancy | 0 |
| 67 | Higgins Quasebarth and Partners, LLC | Consultancy | 2 |
| 68 | High-Point Rendel | Consultancy | 13 |
| 69 | Hill Cannon | Consultancy | 1 |
| 70 | Hill International Dubai | Consultancy | 40 |
| 71 | Hill International Qatar | Consultancy | 9 |
| 72 | Hill International, Inc. | Consultancy | 7 |
| 73 | Hill International, Inc. | Consultancy | 3 |
| 74 | Hill Rom Industries | Consultancy | 1 |
| 75 | Hilliard Blueprint | Consultancy | 1 |
| 76 | Hilling & Partners Ltd. | Consultancy | 0 |
| 77 | Hines Irrigation Consultants Inc | Consultancy | 1 |
| 78 | Historic Resources Group | Consultancy | 2 |
| 79 | Hjellnes Consult AS | Consultancy | 14 |
| 80 | HKS Strategy | Consultancy | 1 |