Altered State

Altered State may refer to:
 * Altered state of consciousness

Music

 * Altered State (band)
 * Altered State (Altered State album)
 * Altered State (Tesseract album)
 * Altered State (Yellowjackets album)
 * Altered State (Stu Dent album)
 * "Altered State", the 12th movement of Mike Oldfield's Tubular Bells II
 * Altered States of America, a mini CD by Agoraphobic Nosebleed

Other uses

 * Altered States, a novel by Paddy Chayefsky
 * Altered States, a 1980 film based on the novel