- X (USA punk band)
- X (Japanese rock band, changed name for X JAPAN in 1992-08)
- X JAPAN (PSYCHEDELIC VIOLENCE CRIME OF VISUAL SHOCK)
- X-Divide
- X-Ecutioners
- X-Marks the Pedwalk
- X-Press 2
- X-Rx
- X-TinXion
- X-Wife
- X, The
- Xabec
- Xandria
- XBRAINIAX
- XBXRX
- Xcerts, The
- xDEATHSTARx
- xDisciplex A.D.
- Xe-NONE
- Xeno and Oaklander
- Xenomorph
- Xentrifuge
- Xentrix (UK thrash metal band)
- Xerath
- Xero (aka “Hybrid Theory” and later “Linkin Park”)
- Xero Sum (Alternative/metal/rock band based in Indianapolis, IN, US.)
- Xerxes
- XIII. Století
- Xilent (Producer Eryk Kowalczyk)
- Xindl X (Ondřej Ládek)
- Xiu Xiu
- XIV Dark Centuries
- XL (Finnish electronic jazz band)
- XL5
- xotox
- XP8
- Xploding Plastix
- XPQ-21
- XTC
- xTyrantx
- Xutos & Pontapés
- XX Cortez
- xx, The
- XXX Maniak
- XYZ (USA metal band)
- Xzibit
