Bhaiṣajyaguru (Sanskrit: भैषज्यगुरु, Chinese: 藥師佛, Japanese: 薬師仏, Korean: 약사불, Standard Tibetan: སངས་རྒྱས་སྨན་བླ), or Bhaishajyaguru, formally Bhaiṣajya-guru-vaiḍūrya-prabhā-rāja ("Medicine Master and King of Lapis Lazuli Light"; Chinese: 藥師琉璃光(王)如來, Japanese: 薬師瑠璃光如来, Korean: 약사유리광여래), is the Buddha of healing and medicine in Mahāyāna Buddhism. Commonly referred to as the "Medicine Buddha", he is described as a doctor who cures suffering (Pali/Sanskrit: dukkha/samsara) using the medicine of his teachings.
Bhaiṣajyaguru's original name and title was rāja (King), but Xuanzang translated it as Tathāgata (Buddha). Subsequent translations and commentaries followed Xuanzang in describing him as a Buddha. The image of Bhaiṣajyaguru is usually expressed with a canonical Buddha-like form holding a gallipot and, in some versions, possessing blue skin. Though also considered to be a guardian of the East, in most cases Akshobhya is given that role. As an exceptional case, the honzon of Mount Kōya's Kongōbu Temple was changed from Akshobhya to Bhaiṣajyaguru.