| Hangul: | 송준길 |
| Hanja: | 宋浚吉 |
| Rr: | Song Jungil |
| Mr: | Song Chungil |
| Hangulho: | 동춘, 동춘당 |
| Hanjaho: | , |
| Rrho: | Dongchun, Dongchundang |
| Mrho: | Tongch'un, Tongch'untang |
| Hangulph: | 문정 |
| Rrph: | Munjeong |
| Mrph: | Munchŏng |
| Korean name | |
Song Chun-gil (; 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. He eventually became the 5th great-grandfather of Empress Myeongseong and the 6th great-grandfather of Empress Sunmyeong.
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).