Cassius is a French house music duo consisting of producers Philippe Cerboneschi and Hubert Blanc-Francard, better known as Philippe Zdar and Boom Bass.

In January 1999, they released their first single to become a mainstream hit, "Cassius 1999". It was published by Virgin Records, and entered the UK Top 40 chart at number seven.

This was soon followed by their debut album, 1999, which had two more singles released from it, "Feeling For You" and "La Mouche". The music videos for "Cassius 1999" and "Feeling for You" portrayed the character Deadman, from DC Comics, as a DJ superhero.

2002 saw their second album release, Au Rêve. This featured the "empowered female disco" track "I'm a Woman", with Jocelyn Brown on vocals, as well as the hit single "The Sound of Violence", featuring Steve Edwards on vocals.

This album also had collaborations with Wu-Tang Clan member Ghostface Killah and Leroy Burgess.

Cassius returned to the studio in 2006, for the more experimental single "Toop Toop", but the next album, titled 15 Again, features more vocal collaborations than the duo had done with Au Rêve.