| 1A Pharma | The 1 A Pharma GmbH focuses since 1997, on the production and marketing of generic pharmaceuticals in high quality. |  |
| Abadi Ahmad | Specialist for ophthalmology. | |
| Abel Jan Odorich | Specialist for ophthalmology. | |
| Abela-Formanek Claudette | Specialist for ophthalmology. | |
| Abou-Harb Ayman | General medical practitioner, specialist for general medicine. | |
| Aboul Enein Hassan | General medical practitioner, specialist for general medicine. | |
| Achen-Apotheke | Achen-Apotheke Mag pharm Bernd Knetsch in Kramsach., pharmacy in Kramsach. | |
| Achinewhu Ndanti Kemati | General medical practitioner, specialist for general medicine. | |
| Achleitner Ute Dr | Achleitner Ute Dr, veterinary surgeon in Ried im Innkreis. | |
| Ackerl Beatrix | General medical practitioner, specialist for general medicine. | |
| ACT Fitness Wals | ACT Fitness. Wellness and Fitness enterprise. | |
| ACT Fitness Wörgl | ACT Fitness. Wellness and Fitness enterprise. | |
| Activa Apotheke | Activa Apotheke Mag pharm Folberth KG in Wolfsberg., pharmacy in Wolfsberg. | |
| Adalbert Stifter-Apotheke | Adalbert Stifter-Apotheke, pharmacy in the 20th district of Vienna. | |
| Adam Ingrid | General medical practitioner, specialist for general medicine. | |
| Adelsmayr Stephan Dipl-TA | Adelsmayr Stephan Dipl-TA Dr, veterinary surgeon in Bad Ischl. | |
| Adensamer Christian | General medical practitioner, specialist for general medicine. | |
| Adlassnig Gert Dipl-TA Dr | Adlassnig Gert Dipl-TA Dr, veterinary surgeon in Weikersdorf am Steinfelde. | |
| Adler Apotheke | | |
| Adler Apotheke | | |