The 2011 Korea National League was the ninth season of the Korea National League.
The number of post-season playoffs' teams were increased to six and the playoffs were operated in the same format as the K League Championship.
Before the start of the 2011 season, Yesan FC withdrew from the league due to its financial difficulty.
[1] Hyundai Mipo Dockyard won 2–1 on aggregate.
Danilo Teixeira who played the least time among top goalscorers won the top goalscorer award