Hǎo Dàtōng 郝大通 (1140–1212), zì Tài gǔ 太古, hào Guǎng níng zǐ 廣寧子, was one of the Seven Perfected of Quán zhēn, founder of the Huá shān 華山 branch. Particularly devoted to cosmological-diagrammatic speculation on the Yì jīng. Author of KR5e0063 Tài gǔ jí 太古集.