This article is about a music genre. For other uses of the phrase see acid (disambiguation).

Acid rock is a form of psychedelic music and was the first form of it to achieve popular acclaim. The term acid rock was much used in its heyday, but has fallen into disuse except for putting this music into its historical perspective.

Notable examples of acid rock tracks and singles include:

• Hole In My Shoe (Traffic, 1967).
• See Emily Play (Pink Floyd, 1967).
• Lucy in the Sky with Diamonds (The Beatles), 1967).
• Strawberry Fields Forever (The Beatles, 1967).
• In-A-Gadda-Da-Vida (Iron Butterfly, 1968).