Base Ball Bear is a 4-member Japanese rock band from Tokyo that made its major debut in 2006 with EMI Music Japan. Although assembled in autumn 2001, the band formally began in 2002, and started off with self-produced releases.

Their style influences include Japanese indie rock bands Number Girl and Supercar, and British rock bands such as Oasis. They have been noted for the "nostalgic" feel of band leader Yūsuke Koide's lyrics, often about teenage life and memories. Base Ball Bear are also known for their contributions to the soundtrack of the movie Linda Linda Linda (in which female bassist Shiori Sekine had a leading role) and performing the themes to the anime series Toshokan Sensō, Ōkiku Furikabutte and Gintama.