Seo Yong-duk (; born 10 September 1989) is a South Korean football midfielder.
Seo joined Omiya Ardija in 2009. He made his debut for professional league on 18 July 2009 after coming on as a substitute in the 44th minute in Omiya Ardija's 0âÂÂ3 loss away to FC Tokyo. He was a member of the South Korea national U-20 team for the 2009 FIFA U-20 World Cup.