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. It often uses new recording techniques and effects and draws on non-Western sources such as the ragas and drones of Indian music.

It was pioneered by musicians including The Beatles, The Byrds and The Yardbirds, emerging as a genre during the mid 1960s among folk rock and blues rock bands in United States and the United Kingdom, such as Grateful Dead, Jefferson Airplane, The Jimi Hendrix Experience, Cream and Pink Floyd. It reached a peak in between 1967 and 1969 with the Summer of Love and Woodstock Rock Festival, becoming an international musical movement and associated with a widespread counter-culture, 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.

Psychedelic rock influenced the creation of psychedelic pop and psychedelic soul. It also bridged the transition from early blues- and folk music-based rock to progressive rock, glam rock, hard rock and as a result influenced the development of sub-genres such as heavy metal. Since the late 1970s it has been revived in various forms of neo-psychedelia.