Charles Alexander Clouser (born June 28, 1963 in Hanover, New Hampshire) is a musician whose activities include playing keyboard and drums, music programming, engineering, and mixing. He was a member of the band Nine Inch Nails from 1994-2000, and has created remixes for bands such as Deftones, White Zombie, Marilyn Manson, Rammstein, and many more.

Clouser has also worked as a film and television composer, scoring the SAW series of films, as well as Death Sentence (2007), Resident Evil: Extinction (2007), Dead Silence (2007), and Deepwater (2005). On television, he is the composer for the NBC TV series Las Vegas and the CBS series Numb3rs.