Psychedelic rock is a style of rock music that is inspired or influenced by psychedelic culture and attempts to replicate and enhance the mind-altering experiences of psychedelic drugs, most notably LSD. It often uses new recording techniques and effects and sometimes draws on sources such as the ragas and drones of Indian music.

It was pioneered by musicians including the Beatles, the Beach Boys, the Byrds, and the Yardbirds, emerging as a genre during the mid-1960s among folk rock and blues rock bands in the United Kingdom and United States, such as Grateful Dead, Jefferson Airplane, the Jimi Hendrix Experience, Cream, the Doors and Pink Floyd. It reached a peak in between 1967 and 1969 with the Summer of Love and Woodstock Rock Festival, respectively, becoming an international musical movement and associated with a widespread counterculture, before beginning a decline as changing attitudes, the loss of some key individuals and a back-to-basics movement, led surviving performers to move into new musical areas.