Block B (Korean: 블락비) is a South Korean boy band created by Cho PD in 2011. The group debuted with seven members: Taeil, B-Bomb, Jaehyo, U-Kwon, Park Kyung, Zico, and P.O.

In February 2011, Cho PD announced that he would be spending $1.4 million USD to create a seven-member hip hop group under his "Creating Korea's Eminem Project". On April 13, 2011, their debut music video for "Freeze!" was released, but banned by the Commission of Youth Protection because they felt that it was too sexy for Korean television. As a result, the song could not be sold to minors under the age of 19, and the video could not be aired before 10 pm. On April 15, 2011, Block B made their live debut on KBS Music Bank. The group followed up with another track, "Wanna B". A mini album, New Kids on the Block, was released on June 23, 2011.

On June 22, 2011, the first episode of MTV's eight-episode series Match Up! was aired featuring Block B and B1A4. On October 16, 2011 MTV started airing a series of specials for the Match Up series that followed Block B as they promoted in Japan.