Cause 4 Concern (C4C) is a drum and bass recording and production group, consisting of Ed Holmes, Mark Clements, Stuart Perkins, and Toby Bu. Founded in 1999, the group initially signed with Moving Shadow label under the alias nCode. Soon, however, the group changed its name to Cause 4 Concern and started their own record label, Cause 4 Concern Recordings, primarily for releasing their own material. Since 1999, Cause 4 Concern produced over 30 releases of their own material, mostly on untitled 2-track 12" vinyl records.

C4C track "Spasm" was featured in GTA III video game, on MSX FM radio.

Cause 4 Concern also released several records under the aliases Nomis and Troubled Mindz.