Park Sung-jin (Korean: 박성진; born January 16, 1993), also known by his mononym Sungjin, is a South Korean musician, singer, songwriter, and guitarist. He is best known as the leader, guitarist and vocalist of South Korean pop rock band DAY6.

On October 16, 2024, it was announced that he would make his solo debut with a full-length album entitled 30. The album was released on November 5, 2024. He would also hold his first solo concert from November 8, 2024 to November 10, 2024. Read more on Last.fm. User-contributed text is available under the Creative Commons By-SA License; additional terms may apply.