CAS or CaS can refer to two artists:

1. CAS is really dead.

Grime artist from Tottenham, North London.

The content of CAS'' lyrics are mainly focused on narcotics but do contain some references to the supernatural. CAS is part of the North London based crew/label/company Proper P. Currently CAS is working on a mixtape titled Commercial which is supposedly coming out "soon".

2. CaS is a fictional band from the visual novel “Boku ga Tenshi ni Natta Wake” developed by Overdrive and first released on February 28, 2013.