Nowon B (Korean: 노원구 을) is a constituency of the National Assembly of South Korea.

[1] Kim Yong-chae of the right-wing New Democratic Republican Party was the first member to represent Nowon B, narrowly defeating Lim Chae-jung of the centre-left Peace Democratic Party by a little over 1,000 votes.

[2] In the following election, Kim Yong-chae had initially won re-election by a margin of thirty-six votes.

However, after it was discovered that a bundle of one hundred votes were mixed up and not counted properly, a recount was performed.

The recount declared Lim Chae-jung of the centre-left Democratic Party the winner with only 172 votes separating him from incumbent Kim Yong-chae.