Son Yeon-jae KTM (born 28 May 1994 in Seoul) is a South Korean retired individual rhythmic gymnast. She is a former member of the South Korean national gymnastics team, based in Taereung, Seoul. She is the 2014 Asian Games All-around Champion, the 2010 Asian Games all-around bronze medalist, three-time (2016, 2015, 2013) Asian Championships All-around Champion. She is managed by the IB Sports agency. Son trained in Russia. She is also a recipient of the Talent Medal of Korea in 2011.
Son began gymnastics at a young age to help her lose weight. In 2008, she won the all-around gold medal at the Angel Cup in Malaysia. In 2009, she performed for the opening ceremony of Olympic and World champion figure skater, Kim Yuna's Festa on Ice. In 13–15 November, she became the junior all-around champion at the Slovenian Challenge Tournament, it was the first time a South Korean rhythmic gymnast won a gold medal at any International Tournaments level of FIG. Son became a star in Korea, similarly as Olympic champion Kim Yuna, after grabbing a medal in individual all-around at the 2010 Asian Games in Guangzhou, becoming the first South Korean rhythmic gymnast to do so. Soon after that, she went to Russia for long-term training.