Lee Sung-min (Korean: 이성민; born October 15, 1968) is a South Korean actor. He first gained recognition for his supporting roles in television and film. He is best known for his performances in the series Golden Time (2012), Misaeng: Incomplete Life (2014), and Reborn Rich (2022), winning Best Actor at the Baeksang Arts Awards for the latter two works.

Lee has also received critical acclaim for his role in the espionage film The Spy Gone North (2018), for which he won several Best Actor awards. His other notable films include The Sheriff in Town (2017), The Witness (2018), The Man Standing Next (2020), and Handsome Guys (2024).