Yi Ch'ae (; 1616 â 1684) was a mid-Joseon Confucian writer, known for compiling the Tonggyà Âng chapki with Gyeongju magistrate, Min Chu-myà Ân.
Yi Ch'ae was born in 1616 in Yangdong, Gyeongju, as the son of gentlemen for escort service () Yi Kyo (), of the Yeoju Yi clan, and his wife, Lady Chà Âng, of the Hadong Chà Âng clan. His art name was Mongam and his courtesy name was Sà Âgo. At the age of 8 or 9, he learned how to write from his grand-uncle, Yi à ¬i-hwal (). In 1631, , as magistrate of Gyeongju, met the 15-year-old Yi Ch'ae and was impressed by his scholarly talents, marrying his granddaughter to Yi.
In 1666, Yi Ch'ae would pass the licentiate examinations. In 1669, Yi would compile a local gazetteer, the Tonggyà Âng chapki (), or the Miscellaneous Records of the Eastern Capital, with Gyeongju magistrate, Min Chu-myà Ân (). In 1676, Yi Ch'ae was recommended as a person of merit and integrity () to be appointed to a government post. Yi was given the offices of Yà Ângnà Âng tomb guardian () and assistant supervisor at the Ice Storage (), but declined the posts.
In 1683, Yi fell ill and died the following year in 1684.