Mark Behn was a founding member and bassist of the American heavy metal band Malice, active during their classic era from 1981 through 1988, and part of their first reunion phase from 2006 to 2011.

Originally from Portland, OR, Behn had played in local bands Fire Eye and Kharma before joining Malice. Founder Jay Reynolds recruited him and drummer Pete Laufman to move to Los Angeles in the early‑1980s to form the band's core lineup.

Malice contributed two tracks—“Captive of Light” and “Kick You Down”—to the first Metal Massacre compilation in 1982, becoming the only band to appear twice on that seminal volume. Their live debut came soon after at the Troubadour in November 1982, where they headlined with Metallica opening the show!

Behn played on Malice’s first two albums on Atlantic Records: In the Beginning... (1985) and License to Kill (1987), as well as the Crazy in the Night EP (1989). On the debut album, he also contributed Taurus synthesizer pedals in addition to bass.

After initially departing Malice, Behn worked on other projects, including Monster (with Kharma bandmate Pete Holmes), showing his continued involvement in the metal scene.

Following the band's initial breakup, Behn returned during its 2006 reunion and contributed to early sessions for the eventual 2012 comeback album New Breed of Godz.