| Rank | Clinic Name | Patient Rating | Country | Lead Doctor | experience | Techniques | Best For | Why It’s Ranked | Accreditations |
|---|---|---|---|---|---|---|---|---|---|
| #1 | 4.7 / 5 (492) | Barcelona, Spain | — | 23,000+ treatments | Bladder removal, Radiotherapy for breast cancer | — | — | Joint Commission International , European Foundation for Quality Management | |
| #2 | 5.0 / 5 (3) | Madrid, Spain | — | — | Gamma Knife for brain tumor | — | — | Joint Commission International , International Organization for Standardization | |
| #3 | 4.7 / 5 (17) | Madrid, Spain | — | 26,000+ treatments | Lobectomy, Chemotherapy for ovarian cancer | — | — | European Foundation for Quality Management, TÜV AG Сompany Research & Investing Certificate | |
| #4 | 4.7 / 5 (7) | Pamplona, Spain | — | — | Allogenic bone marrow transplantation from a related donor, Craniotomy | — | — | Joint Commission International , European Society for Medical Oncology | |
| #5 | 2.5 / 5 | Madrid, Spain | — | — | PET-MRI | — | — | European Foundation for Quality Management, Certification according to DIN EN ISO 9001 by TÜV NORD CERT |