Bidam (毗曇 ? - 26 February, 647) was known for revolting against the reign of Queen Seondeok of Silla. He was a Sangdaedeung (상대등/ The highest post of government) during the end of Queen Seondeok of Silla's reign. Details about his birth or his achievements are vaguely known as there are no actual records containing them, but it is believed that he came from a royal family.