Magnetic therapy, or Magnotherapy, or Magnet therapy is an alternative medicine claiming that certain medical disorders can be effectively treated by exposure to magnetic fields. This article treats claims concerning static magnetic fields. See electromagnetic therapy for treatments involving pulsed fields.

Proponents of magnet therapy claim that subjecting certain parts of the body to doses of magnetic "energy" (or fields) has a beneficial effect. This belief has led to the popularization of an industry involving the sale of magnetic-based products for "healing" purposes: magnetic bracelets and jewelry; magnetic straps for wrists, ankles, and the back; shoe insoles, mattresses, and magnetic blankets (blankets with magnets woven into the material); and even water that has been "magnetized".