Brainbox is a Dutch rock group from the late 1960s / early 1970s. It was founded in Amsterdam by guitarist Jan Akkerman, drummer Pierre van der Linden, and singer Kazamir (Kaz) Lux.
Their debut single was "Down Man", which established their progressive blues sound. They had several hit singles in the Netherlands, including "Between Alpha and Omega", "Doomsday Train", and "Smile". Soon after they released their first album, Akkerman and van der Linden left the group to join Focus. They were replaced by guitarists Herman Meyer and Rudie de Quelijoe and drummer Frans Smit. Meyer was later replaced by John Schuursma.
After Kaz Lux left the group in 1971, their popularity waned and they split up in 1972. In 2004 Kaz Lux reassembled the band (though without Jan Akkerman) and they performed in the Netherlands.