Bistam or
Vistahm (also transliterated Wistaxm, ), was a
Parthian dynast of the
Ispahbudhan house, and maternal uncle of the
Sasanian shah of Persia,
Khosrau II (reigned 591–628). Vistahm helped Khosrau regain his throne after the rebellion of
Bahram Chobin, but later led a revolt himself, which encompassed the entire
Iranian East before being suppressed.