| Seo Yong-duk | |
| Fullname: | Seo Yong-duk[1] |
| Birth Date: | 10 September 1989 |
| Birth Place: | South Korea |
| Height: | 1.75 m |
| Position: | Midfielder |
| Youthclubs1: | Yonsei University |
| Years1: | 2009–2010 |
| Clubs1: | Omiya Ardija |
| Caps1: | 5 |
| Goals1: | 0 |
| Years2: | 2010 |
| Clubs2: | FC Tokyo |
| Caps2: | 0 |
| Goals2: | 0 |
| Years3: | 2011–2014 |
| Clubs3: | Kataller Toyama |
| Caps3: | 118 |
| Goals3: | 13 |
| Years4: | 2014–2015 |
| Clubs4: | Ulsan Hyundai |
| Caps4: | 20 |
| Goals4: | 1 |
| Years5: | 2016–2018 |
| Clubs5: | FC Anyang |
| Caps5: | 34 |
| Goals5: | 3 |
| Years6: | 2017–2018 |
| Clubs6: | → Asan Mugunghwa (army) |
| Caps6: | 19 |
| Goals6: | 0 |
| Years7: | 2020 |
| Clubs7: | Ho Chi Minh City |
| Caps7: | 13 |
| Goals7: | 1 |
| Nationalyears1: | 2007–2009 |
| Nationalteam1: | South Korea U-20 |
| Nationalcaps1: | 17 |
| Nationalgoals1: | 1 |
| Pcupdate: | 21 December 2019 |
| Ntupdate: | 9 October 2009 |
| Hangul: | 서용덕 |
| Hanja: | 徐庸徳 |
| Rr: | Seo Yong-deok |
| Mr: | Sŏ Yong-tŏk |
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 0–3 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.
| Club performance | League | Cup | League Cup | Total | |||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Season | Club | League | Apps | Goals | Apps | Goals | Apps | Goals | Apps | Goals | |
| Japan | League | Emperor's Cup | J.League Cup | Total | |||||||
| 2009 | Omiya Ardija | J1 League | 4 | 0 | 0 | 0 | colspan="2" | - | 4 | 0 | |
| 2010 | 1 | 0 | colspan="2" | - | 0 | 0 | 1 | 0 | |||
| FC Tokyo | 0 | 0 | 1 | 0 | 0 | 0 | 1 | 0 | |||
| 2011 | Kataller Toyama | J2 League | 29 | 1 | 1 | 0 | colspan="2" | - | 30 | 1 | |
| 2012 | 38 | 5 | 0 | 0 | colspan="2" | - | 38 | 5 | |||
| 2013 | 35 | 7 | 1 | 0 | colspan="2" | - | 36 | 7 | |||
| 2014 | colspan="2" | - | |||||||||
| Total | 107 | 13 | 5 | 0 | 0 | 0 | 110 | 13 | |||