U T'ak (; 1262âÂÂ1342), also known as Woo Tak, was a Korean Neo-Confucian scholar and philosopher during KoreaâÂÂs Goryeo dynasty. He was also commonly known as Yà Âktong Sà Ânsaeng (). His art names were Paegun and Tanam, his courtesy names were Ch'à Ânjang and T'akpo, and his posthumous name was Munhà Âi. U T'ak helped spread Neo-Confucianism, which had come from the Yuan dynasty, in Korea. He was a disciple of the Neo-Confucian scholar, An Hyang.
U T'ak belonged to the Danyang U clan. He was the 7th generation descendant of the Danyang U clan's founding ancestor, U Hyà Ân. U had two sons, U Wà Ân-gwang () and U Wà Ân-myà Âng (). U T'ak is considered as the ancestor of the Moonheegong branch () of the Danyang U clan. By 1308, U held the Censorate office of royal inspector (), however he protested newly reigning King Chungseon's relationship with late king's former concubine, Lady Sukchang by bringing an axe to court and appealed to the king to reconsider his ways. U would retire early from the court after this incident.
U T'ak was a respected scholar and centuries after his death, a Joseon Confucian scholar, Yi Hwang, helped to establish the in honor of U T'ak in 1570.