Sayyed Bozorg "Moody" Mahmoody (Persian: دكتر سيد بزرگ محمودى c. 1939 – August 23, 2009) was an Iranian professor, engineer, and anesthesiologist, best-known for being accused of taking his American wife Betty and their daughter Mahtob to his native country and allegedly keeping them hostage there for a period of eighteen months during the mid-1980s.