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Hyoyeon (효연), also known as DJ HYO and HYO, is a South Korean singer under SM Entertainment. She is a member of the Korean pop girl group Girls' Generation.
- Stage Names: Hyoyeon (효연), DJ HYO, HYO
- Birth Name: Kim Hyoyeon (김효연)
- Nicknames: Princess Fiona, Dancing Queen
- Birthdate: September 22, 1989
- Birthplace: Incheon, South Korea
- Blood Type: AB
- Height: 160cm
- Weight: 49kg
- Religion: Christian
- Languages: Chinese (Fluent), Japanese (Basic), English (Basic)
- Education: Chungbuk Middle School
- Hobbies: Shopping, Movies
- Relationship: Kim Joon Hyung (Writer) (2012–2014)
- Girls' Generation (2007–)
- Girls' Generation-Oh!GG (2018–)
- YOUNIQUE UNIT (2012)
- Girls On Top (2021–)
- Girls' Generation (2007–)
- [2022.05.16] DEEP (HYO)
- [2016.08.26] Born to be Wild (Hyoyeon, Min, Jo Kwon)
- [2016.12.02] Mystery
- [2017.06.01] Wannabe
- [2018.04.18] Sober (HYO)
- [2018.11.13] Punk Right Now (HYO)
- [2019.02.23] Punk Right Now (Remixes) (HYO)
- [2019.07.20] Badster (HYO)
- [2020.07.22] DESSERT
- [2020.10.30] Think About Me (Raiden, HYO)
- [2021.08.09] Second (HYO)
- [2016.06.28] Taeyeon - Why (#5 Up & Down (feat. Hyoyeon))
- [2020.06.05] GOOD GIRL Episode 1 (#4 TURL (Hyoyeon, Cheetah))
- [2020.06.19] GOOD GIRL Episode 3 (#1 WITCH (Manyeosanyang) (Yeeun, Jiwoo, Jamie, Cheetah, Hyoyeon))
- [2020.06.26] GOOD GIRL Episode 4 (#4 GG (Ailee, Jiwoo, Hyoyeon))
- [2020.07.03] GOOD GIRL FINAL (#5 I Do What I Want (Hyoyeon, Lee Young Ji))
- [2021.11.04] Lil Cherry - G! REMIX (feat. HYO)
- [2021.12.27] 2021 Winter SMTOWN : SMCU EXPRESS (#10 Bich (Hope from KWANGYA))
- [2022.12.26] 2022 Winter SMTOWN : SMCU PALACE (#5 Jet, #10 Good To Be Alive)
-  Oh! My Lady (cameo)
-  Dancing With the Stars 2
-  Good Girl
-  Younique Unit - Maxstep
-  Amber - SHAKE THAT BRASS
-  Tiffany Young - Teach You
- She is most known for her popping, waving, and Hip-hop dancing techniques that she learned from the Winners Dance School while she was a trainee.
- Prior to her debut, she traveled to Beijing, China in 2004 with Super Junior’s Siwon to learn Mandarin and more about Chinese culture.
- She was a trainee with SM Entertainment for six years and one month.
- She was BoA's silhouette dancer in her "Over the Top" performance at the 2005 M.net Asian Music Awards.
- She became an SM Entertainment trainee when she was twelve years old in 2000 by being discovered at an SM Entertainment casting system.
- She learned Jazz dance, Latin dance, and a variety of other styles when she was in elementary school. She didn't become interested in Hip-hop dance until she entered junior high school.
- Her favorite foods are soup and Korean food.
- Her favorite fashion is feminine shoes with baggy pants
- Her motto is "Everyone that works hard will succeed".