Hayoon (하윤), alternatively spelled as Hayun, may refer to:
- Artists
- Seol Ha Yoon, a soloist singer
- People
- Hayoon (currently known as Daisy) of DIVA-X
- Lee Hayoon of KIDOLS
- Hayun of PRIMROSE
- Hayun of Rush
- Hayun of STRAW, former member of BaBa and former pre-debut member of BLAZE
- Kang Hayoon of WATERFIRE, former LOUD, Kookmin Singer and Build Up : Vocal Boy Group Survivor contestant
- Hayoon, former member of BONUSbaby and myB and former MIXNINE contestant
- Lee Hayun, former member of Brave Girls and Date
- Kim Hayoon, former member of Chocofive
- Hayoon, former member of GeeGu and former pre-debut member of Ndear
- Ha Yun, former member of Hi-L
- Do Hayoon (formerly known as Ji Ho), former member of ILUV and We Girls and former pre-debut member of Ndear
- Kim Hayoon, former Produce 101 contestant
- Jung Hayoon, former Under 15 contestant