Song Chun-gil (Korean: 송준길; Hanja: 宋浚吉; 28 December 1606 – 2 December 1672), also known by his art name Tongch'untang, was a Korean politician and Neo-Confucian scholar, who lived during the Joseon period.
Born in Okcheon, North Chungcheong Province, he was the best friend and a distant relative of Song Si-yol.
His daughter, Lady Song, was the mother of Queen Inhyeon, who would become the second wife of King Sukjong.
Song Chun-gil's descendants through his second daughter had made him the maternal grandfather of Min Jin-hu, Min Jin-won, and Queen Inhyeon.
When Empress Myeongseong became Queen, she also close connections to the families of her 5th maternal great-grandmother (Eunjin Song clan), and 4th maternal great-grandmother (Jinju Jeong clan).