B'z (ビーズ, Bīzu) is a Japanese rock duo, consisting of guitarist, composer and producer Takahiro "Tak" Matsumoto (松本 孝弘, Matsumoto Takahiro) and Koshi Inaba (稲葉 浩志, Inaba Kōshi) as vocalist and lyricist.

B'z is one of the best-selling music artists in the world, the best-selling in their native Japan, having released 46 consecutive No. 1 singles, 25 No. 1 albums and sold more than 80 million records worldwide. In 2003, HMV Japan ranked the band at number 30 on their list of the 100 most important Japanese pop acts. In 2007, B'z became the first band from Asia to have their handprints and signatures put up in the Hollywood's RockWalk.