| # | Company name | Role | # of projects |
|---|---|---|---|
| 41 | Hawley & Partners | Consultancy | 0 |
| 42 | Hbc Engineering Inc | Consultancy | 1 |
| 43 | HBS Consulting Engineers Ltd. | Consultancy | 1 |
| 44 | Hbw Associates, Inc. | Consultancy | 1 |
| 45 | Health Fitness Dynamics Inc | Consultancy | 1 |
| 46 | Health Futures Developement Group LLC | Consultancy | 2 |
| 47 | HEG Beratende Ingenieure Berlin GmbH | Consultancy | 0 |
| 48 | Heiberg & Tveter AS | Consultancy | 1 |
| 49 | Helle Engineering Corp | Consultancy | 6 |
| 50 | Help International | Consultancy | 0 |
| 51 | Henco Drafting and Arts Supplies | Consultancy | 1 |
| 52 | Henry J Coupe Assocs Inc | Consultancy | 1 |
| 53 | Henry Jensen A/S | Consultancy | 3 |
| 54 | HERA -Health Education Research Associates | Consultancy | 0 |
| 55 | Heritage Building Systems | Consultancy | 1 |
| 56 | Heritage Consulting Group Corporation | Consultancy | 17 |
| 57 | Hermans Digital Blue Inc | Consultancy | 0 |
| 58 | Hermolle Associates Ltd. | Consultancy | 0 |
| 59 | Hernandez Blueprinting Services | Consultancy | 0 |
| 60 | Heron Maps | Consultancy | 1 |