藥師琉璃光王如來、藥師琉璃光王佛，為佛教東方淨琉璃世界之教主。
日光遍照菩薩和月光遍照菩薩是藥師如來的兩大脅侍，待藥師如來佛滅後，二菩薩次補佛位，民間尊稱藥師如來、日光遍照菩薩和月光遍照菩薩為東方三聖。
以「淨琉璃」為名，乃取琉璃之光明透徹以喻國土清靜無染。東方世界無量佛國中另有一佛國曰「妙喜世界」，佛號阿閦佛（不動如來），其佛身色亦為藍色。
 
Medicine Buddha 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 dukkha (suffering) using the medicine of his teachings.