Steve Jansen (born Stephen Batt, 1 December 1959, in Beckenham, Kent, England) is an English drummer, percussionist, singer and composer. He was educated at Catford Boys' School, Catford, South East London, where he failed academically, leaving at 16.
He is best known as a founding member of the group Japan, along with his brother David Sylvian (vocals, guitars and keyboards), Mick Karn (bass guitar), Richard Barbieri (keyboards), and Rob Dean (guitar).
After Japan broke up in 1982, Jansen recorded with bandmate Richard Barbieri under the name The Dolphin Brothers, with Jansen handling lead vocals as well as drums and percussion.
In 1991, Jansen, Barbieri, and Karn formed Medium Productions as a venue for releasing their own music, as well as releases by other artists.
Jansen has worked extensively as a session musician and in collaboration with a wide range of international artists, such as Yukihiro Takahashi and Italian singer-songwriter Alice. His most recent project is Nine Horses with David Sylvian and Burnt Friedman, which has given birth to one album and one extended play CD released through Sylvian's record label Samadhi Sound.