Cloud 9 is the alias of Gavin Cheung, a UK drum and bass and jungle producer from Hitchin. He is associated with jungle, old school hardcore, electronic music and breakbeat, and is one of several acts to use the Cloud 9 name.

As Cloud 9, Cheung works within the British drum and bass and jungle scene. The name is also used by other unrelated artists, including a New York house producer, a hip-hop band, a Brighton hip-hop producer, a nu jazz project, an Austrian artist, an a cappella group from the University of California, Santa Cruz, a Korean pop/rock band, and a separate group of six musicians.