Lee Sung (Korean: 이승만; born 16 January 1980), also known as Lee Sung-man, is a South Korean professional golfer.

Lee played on the Nationwide Tour in the United States in 2001 and 2003.

He picked up his first tour victory at the 2007 Bangkok Airways Open.

He represented South Korea at the 2007 Omega Mission Hills World Cup with Lee Seong-ho.

In November 2010 he underwent an operation to his right ear, his hearing is now restored.