Charles Pecher (26 November 1913 – 28 August 1941) was a Belgian pioneer in nuclear medicine. He discovered and introduced strontium-89 in medical therapeutic procedures in 1939. He was the first to report a possible therapeutic role for the beta emitting radionuclide strontium-89 in the palliation of bone pain associated with metastatic bone disease. His autoradiographies of animals or organs after administration of strontium-89 or phosphorus-32 started the development of bone scintigraphy.