Riwoo
- Birthday: 2003-10-22
- Place of birth: Seoul, South Korea
- Also know as: Lee Sang-hyeok
Lee Sang-hyeok (이상혁; born October 22, 2003), known professionally as Riwoo (리우), is a South Korean singer and dancer under KOZ Entertainment. He is a member of the boy group BOYNEXTDOOR.
