|Full name||You Seung-hun|
|National team||South Korea|
|Born||28 June 1983|
|Height||1.79 m (5 ft 10 in)|
|Weight||79 kg (174 lb)|
You Seung-hun (also Yu Seong-hyeon, Korean: 유 승현; born June 28, 1983) is a South Korean former swimmer, who specialized in breaststroke events. He shared bronze medals with Sung Min, Jeong Doo-Hee, and Park Tae-Hwan in the 4×100 m medley relay (3:41.33) at the 2006 Asian Games in Doha, Qatar.
You qualified for the men's 100 m breaststroke at the 2004 Summer Olympics in Athens, by clearing a FINA B-standard entry time of 1:04.28 from the Dong-A Swimming Tournament in Seoul. He blasted a South Korean record and a personal best of 1:03.56 to lead the third heat by 0.28 of a second ahead of Chinese Taipei's Chen Cho-Yi. You failed to advance into the semifinals, as he placed thirty-first overall on the first day of preliminaries.
- "You Seung-Hun". Olympics at Sports-Reference.com. Sports Reference LLC. Retrieved 24 April 2013.
- Marsteller, Jason (7 December 2006). "Park Snares Second Asian Record, Japan Wins Medal Count as Asian Games Come to a Close". Swimming World Magazine. Archived from the original on 9 June 2013. Retrieved 24 April 2013.
- "Swimming – Men's 100m Breaststroke Startlist (Heat 3)" (PDF). Athens 2004. Omega Timing. Retrieved 24 April 2013.
- "Men's 100m Breaststroke Heat 2". Athens 2004. BBC Sport. 14 August 2004. Retrieved 31 January 2013.
- Whitten, Phillip (14 August 2004). "Prelims, Men's 100 Breaststroke: Kitajima, Hansen Qualify One-Two; Japanese Sets Olympic Record". Swimming World Magazine. Archived from the original on 3 December 2013. Retrieved 24 April 2013.
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