Lee Myung-geun (; born 8 April 1978) is a former international South Korean rugby union scrum half and current South Korea Head Coach.
He began playing at Yonsei University before playing for the Korean Armed Forces Athletic Corps during his compulsory military service. In 2004, he moved to Hong Kong to play for Hong Kong Cricket Club, winning the 2004-05 Hong Kong Rugby Club League. In 2005, he moved back to South Korea to play for Samsung SDI in the Korea Rugby League.
In 2007, he moved to Japan joining World Fighting Bull in the Top West League, although winning the league they lost in the promotion play offs. With the collapse of World Fighting Bull in 2009 Myung Geun joined Top League side Kubota Spears.
After ending his playing career at Kubota Spears, he joined their coaching set up before moving back to South Korea to be Backs Coach at his former club Yonsei University.
In 2022, he was named as the Head Coach for South Korea ahead of the 2022 Asia Rugby Championship. He also coached the South Korea Sevens side.