ＡＣＩＤ (1) is a Japanese rock band, founded by Siam Shade's former vocalist, 未来. They started in 2003, after Hideki found enough members and a second singer. Surprisingly, in 2005 he announced that he would be leaving the vocals entirely to Junpeito focus on keyboards. The band consists of Daisuke, Masamitsu, and Kim on guitars, Sei-ichiro on drums, Yuta on bass, Junpei on vocals, and Hideki on keyboards.

Acid (2) was an Austrian rock band of the early seventees. It was founded by Herbert Novacek (v, b), Robert Ponger (k, p, Hammond B3) and RUDI STAEGER (d). They released a self-titled album in 1974 that was quite popular on Austrian radio. Various personnel changes followed through the decade, including Peter Koller (later with Wolfgang Ambros), Hans Zekar, Robert Zidek and Wolfgang Staribacher, and the band released More Acid and Acid Age.

After breaking up in the late 70s, Novacek reformed the band in the 80s for an album called Stress, Volume 1.

Acid (3) was a groundbreaking female fronted speed metal band from Belgium, founded in 1980.

Acid (4) was a Hardcore Punk band from Tokyo, Japan and existed from the late 80's to the early 90's

Acid (5) is french rapper or band

Acid (6) is a Polish drum and bass DJ.