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

The band has released nine full-length studio albums and numerous other releases and live albums. Their music style is primarily influenced by classic rock with elements of modern rock, also combined with a contemporary Korean cultural identity. YB is widely known for their explosive and dynamic live performances, and a resonant directness in vocal style and songwriting. YB has won the "Best Music" award from Korea's three main broadcast stations KBS, MBC and SBS, and in 2011 won the "Mnet Specialized Award"