| 581 | Apolonija d.o.o. | http://www.apolonija.hr |
| 582 | APOSTROF | http://www.apostrof.hr |
| 583 | Appono d.o.o. | http://www.appono.hr |
| 584 | A-Proma d.o.o. | http://www.a-proma.hr |
| 585 | Apropos, agencija | http://www.apropos.hr |
| 586 | APT | http://www.betonska-baza.com |
| 587 | APT Servis d.o.o. | http://www.apt-servis.hr |
| 588 | Aptus d.d. | http://www.sapphire.com.hr |
| 589 | Aqua Optimus d.o.o. | http://www.aqua-optimus.hr |
| 590 | Aqua projekt d.o.o. | http://www.aqua-projekt.com |
| 591 | Aqua promet d.o.o. | http://www.aquapromet.hr |
| 592 | Aquachem d.o.o. | http://www.aquachem.hr |
| 593 | Aquacity d.o.o. | http://www.aquacity.hr |
| 594 | AQUAdac d.o.o. | http://www.aquadac.com |
| 595 | Aquadom d.o.o. | http://www.aquadom-zg.com |
| 596 | Aquanaut Murter d.o.o | http://www.divingmurter.com |
| 597 | Aquarius | http://www.aquarius.hr |
| 598 | Aranea d.o.o. | http://www.aranea.hr |
| 599 | Arausa d.o.o. | http://www.arausa.hr |
| 600 | Arbia d.o.o. | http://www.arbia.hr |