| # | Company name | Role | # of projects |
|---|---|---|---|
| 581 | Adolf Wilhelm Edelsvärd | Architect | 5 |
| 582 | Adolfo Córdova - Oswaldo Nuñez - Carlos Williams | Architect | 1 |
| 583 | Adolfo José Del Vecchio | Architect | 1 |
| 584 | Adolfo Lau | Architect | 0 |
| 585 | Adolfo Morales de los Ríos | Architect | 2 |
| 586 | Adolfo Perez | Architect | 1 |
| 587 | Adolfo Rodriguez Aquitectos | Architect | 1 |
| 588 | Adolph Scherrer | Architect | 4 |
| 589 | Adolph Ziemba AIA | Architect | 0 |
| 590 | Adolpho Lindenberg | Architect | 180 |
| 591 | Adolphus Druiding | Architect | 6 |
| 592 | Adolphus Heiman | Architect | 1 |
| 593 | Adomeit | Architect | 0 |
| 594 | Adot Gazcon & Tagliaferri | Architect | 1 |
| 595 | ADP & Associates of Brooksville Inc. | Architect | 1 |
| 596 | ADP architecten | Architect | 8 |
| 597 | ADP Architekten AG | Architect | 1 |
| 598 | Adriaan Willem Weissman | Architect | 1 |
| 599 | Adrian | Architect | 0 |
| 600 | Adrian Alvarez Architect | Architect | 1 |