| # | Company name | Role | # of projects |
|---|---|---|---|
| 581 | Adjmi & Andreoli | Architect | 7 |
| 582 | Adkisson Harrison & Associates | Architect | 0 |
| 583 | Adler & Sullivan | Architect | 7 |
| 584 | Adler Associates | Architect | 1 |
| 585 | Adler Hans Henrik | Architect | 0 |
| 586 | Adler und Retzbach | Architect | 0 |
| 587 | Adling Associates Architects | Architect | 1 |
| 588 | ADM Architects | Architect | 1 |
| 589 | Adnan Kazmaoğlu | Architect | 6 |
| 590 | Adnan Z Saffarini Engr - Abu Dhabi | Architect | 4 |
| 591 | ADNBA | Architect | 1 |
| 592 | ADNS Architects | Architect | 1 |
| 593 | ADNS Architekti | Architect | 1 |
| 594 | Ado Eigi | Architect | 1 |
| 595 | Adolf C. Ochs | Architect | 1 |
| 596 | Adolf Emil Melander | Architect | 5 |
| 597 | Adolf Florensa Ferrer | Architect | 4 |
| 598 | Adolf Gaudy | Architect | 1 |
| 599 | Adolf K. Kruse & Klaus Kruse | Architect | 3 |
| 600 | Adolf Kirschanitz ZT GmbH | Architect | 1 |