Jun Jae-Youn or Jeon Jae-Yeon (born 9 February 1983) is a South Korean badminton player. Born in Pocheon, Jun was part of the Korea National Sport University. She was the champion at the 2004 Asian Championships in the women's singles event. She played badminton at the 2004 Summer Olympics for South Korea, defeating Charmaine Reid of Canada in the first round but losing to Cheng Shao-chieh of Chinese Taipei in the round of 16. At the 2005 Swiss Open, she was suffered a rupture of the knee cruciate ligament injury at the match against Xu Huaiwen of Germany in the quarter-finals round. Jun also competed at the Olympic Games for the second time at the 2008 Beijing and reach in to the third round. She beat Kamila Augustyn and Chloe Magee in the first and two rounds, but was defeated by Zhang Ning in the straight games.