Yoo Gun-hyung (; born February 14, 1979) is a South Korean record producer. He was credited with production on PSY's 2012 single "Gangnam Style".

Biography Yoo Gun-Hyung was introduced to the world of K-pop in 1996 as one-half (along with Suh Jung-Hwan) of the Korean hip hop duo Untitle.miketastic, "Way Back Wednesday: Spring Fling", www.allkpop, March 21, 2012. Note that although English-language sources sometimes mistakenly call the group "Untitled", the group's music videos feature the spelling "Untitle" and that is the spelling used by major English-language sources on South Korean popular culture, including soompi.com and allkpop.com. Yoo and Suh were both still in high school, and gained particular recognition in the Korean music industry because they were already writing their own songs.miketastic, "Way Back Wednesday: Spring Fling", www.allkpop, March 21, 2012.; thunderstix, "Two Old School Idol Groups Come Together for New Album", soompi.com, May 4, 2011. Their second album, entitled The Blue Color was released in 1997. Untitle disbanded in 1999.

Yoo's collaboration with PSY goes back at least to 2006, with Yoo writing music and PSY writing lyrics for songs on the 2006 album PSY – We Are The One. They have also co-written songs for IVY, Kim Jin-pyo, and Ulala Session.Stewart Ho, "Ulala Session Shakes Things Up With Park Han Byul in Music Video, Makes an All-Kill on Charts", CJ E&M enewsWorld, May 10, 2012.

It has also been reported that Yoo and former Untitle co-member Suh have been working with Jang Woo Hyuk (formerly of H.O.T.) on a solo project.

"Gangnam Style", the lead single of PSY 6 (Six Rules), Part 1, which Yoo co-wrote with PSY, was released on July 15, 2012, and the music video was uploaded to YouTube the same day. Within weeks, the video had made it to No. 3 on YouTube's music video list. Then in August, the video went viral outside of the Korean-speaking world, and by September had become the most "liked" video in the history of YouTube."'Gangnam Style' holds Guinness world record for most 'liked' video in YouTube history", guinnessworldrecords.com, Sept. 20, 2012

Working with Psy Yoo Gun Hyung's current career is centered around Psy and the singers of P NATION. All have songs with titles written by Yoo Gun Hyung.

He collaborated with Psy on the song "1등 (1st Place)" from Psy's 2nd album "Ssa2" (2002), and co-wrote with Psy on the song "Night" (feat. Park Mi-kyung) from the 3rd album "3 Mai".

Yoo has collaborated on almost every song from Psy's fourth album "Ssajib" and onwards, only the title track "Entertainer" () and the song "They Are Friends" () were co-written, but from Psy's fifth album onwards, there are almost no songs written by just Psy or Yoo Gun-hyung exclusively. In the fifth album "PSYFIVE", all but one song was composed and arranged by Psy & Yoo Gun-hyung, and in the now legendary sixth album "Psy 6 (Six Rules)," not only "Gangnam Style," but also "Year of 77 (77학개론)," "What Would Have Been? ()," "Blue Frog" () and "Never Say Goodbye" were all co-written and arranged by Psy Yoo Gun-hyung. The same is true for his later works, "Gentleman" (2013), 7th album "Chiljip Psy-da" (2015), and his 8th album "4×2=8" (2017).

When Psy moved to YG Entertainment in 2010, he followed him, and when Psy left YG Entertainment in 2018 Yoo also left with him, joining him at his Psy's label P Nation in 2019 as a songwriter for all current talent.

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