Hong Daeyong (Korean: ???; Hanja: ???; 12 May 1731 – 17 November 1783), styled Damheon (Korean: ??; Hanja: ??, "Relaxed house") was a philosopher, astronomer and mathematician of the late Joseon Kingdom.
Hong was an early leader of the Profitable Usage and Benefiting the People (Korean: ?????; Hanja: ?????; RR: Iyong Husaeng-pa) school of thought.
It worked to promote the industrialization of his country and the development of trade by positively introducing Western technologies to Joseon Korea.
Hong was a friend of Park Ji-won, who was another leader of the Profitable Usage school.