Ultimate KAOS was a British boyband from the 1990s, who were formed by Simon Cowell. Its original members comprised the then 9 years old Haydon Eshun, Jomo Baxter, Jayde Delpratt, Ryan Elliott and Nico Grant.

In 1992, the band were originally known as Chaos with members Jayde, Jomo and Nico as part of the group (Haydon and Ryan joined later when Ultimate Kaos were born), but their only single issued under this name was a cover version of the Michael Jackson song Farewell My Summer Love. Before they released the single, they were Sinitta's backing dancers, as Sinitta at the time, was dating Cowell. They split up in 1999.