|Born||2 April 1983|
|Revised Romanization||O Eunseok|
At the 2007 FIE World Championships he won the bronze medal in the men's individual sabre category after losing to four-time Olympic champion and ten-time world champion Stanislav Pozdnyakov of Russia 12–15 in the semifinals.
Oh qualified for the 2008 Beijing Olympics for the individual sabre competition. On August 12, 2008, he won his first round 15–8 win against Dmitri Lapkes of Belarus, but ultimately had a 15–11 loss to eventual silver medalist Nicolas Lopez of France in the round of 16. He finished 13th.
At 2012 London Olympics, he participated as substitute for the team sabre competition. Despite not getting his chance for participating in quarterfinal match against Germany, and semifinal match against Italy, he came out on final match against Romania on 8th bout. He faced Alexandru Sirițeanu, who came out as substitute for the Romanian side. The bout finished in just 14 seconds, when Oh accumulated 5 points for the Korean side, while conceding 1 point. Ultimately, he won gold medal along with his teammates Gu Bon-gil, Won Woo-young, and Kim Jung-hwan.
- "Oh Eun-seok Olympic Results". sports-reference.com. Retrieved 2012-06-08.
- osen (2012-08-04). '14초의 찌르기' 오은석, 金 찌른 비장의 '히든카드' [Oh becomes 'key' for gold after '14 seconds of dueling'] (in Korean). Retrieved 2012-09-08.
- "Men's Team Sabre – Olympic Fencing". Official site of the London 2012 Olympic. 3 August 2012. Retrieved 8 September 2012.
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