Abstract: Magnetic resonance (MR) theranostics is a new trend in modern medicine that combines rich diagnostic potentialities of the magnetic resonance method with the therapeutic action of physical fields of different origins on various organs. We consider peculiarities and clinical applications of MR theranostics methods and equipment, including magnetic resonance imaging (MRI), MRI-guided high-intensity focused ultrasound surgery (tumor ablation), radiation (X-ray) therapy, proton therapy, and rf therapy.