Lee Myung-joo (born 24 April 1990) is a South Korean footballer who plays as a midfielder for Incheon United.
After a debut season with the Pohang Steelers, Lee was named as the K-League Rookie of the Year for 2012. In the 2013 season, he scored eight goals to contribute to Pohang's domestic league and cup double success. His performances were rewarded with his inclusion in the K League Classic Best XI for the 2013 season.
On 9 June 2014, Lee joined Al Ain FC, signing a three-year contract.
On 19 June 2017, Lee joined FC Seoul, signing a six-month contract.
Lee made his debut in the South Korea national team on 11 June 2013 in a win against Uzbekistan in the 2014 FIFA World Cup qualification.