YB, formerly known as Yoon Do-hyun Band (Korean: 윤도현밴드), is a South Korean rock band. Formed in 1996, the band consists of Yoon Do-hyun, Heo Jun, Kim Jin-won (drums), Park Tae-hee and Scott Hellowell (guitar). YB rose to major popularity and success during the 2002 World Cup, and once again in 2011 through appearing in the Korean TV show I Am a Singer. They have performed across the world and regularly headline major rock festivals in South Korea.

Yoon Do-hyun is a South Korean hard rock/folk rock singer, musician, and songwriter. He is the founder and lead vocalist of the Yoon Do-hyun Band (YB) since 1996. Yoon is also an MC on TV variety programs and a musical theatre actor.