| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.6 / 5 (174) | Vienna, Austria | 33+ years | Consultation with an oncologist, PET/CT | — | — | World's Best Hospitals 2021 by Newsweek, International Organization for Standardization | ||
| #2 | 4.6 / 5 | Vienna, Austria | — | — | Radiation therapy for colorectal cancer, Radiation therapy for testicular cancer | — | — | World's Best Hospitals 2026 by Newsweek | |
| #3 | 4.2 / 5 (21) | Vienna, Austria | 32+ years | — | — | — | International Organization for Standardization | ||
| #4 | 3.9 / 5 | Vienna, Austria | — | — | — | — | — | ISO 9001:2015 Quality management systems, International Organization for Standardization |