Psychedelic trance (often referred to as psy trance) is a form of trance music, developed in the late 1990's. Trance has a fast beat, in the range 125 to 150 beats per minute (bpm), compared to ambient trance music and other forms like house and techno. It has a strong bass sound that beats continuously without change and is overlaid by many other rhythms. This type of trance is popular in the UK, but is a truly global phenomenon, and interestingly there is an underrepresentation of American artists, although Israeli artists are well represented. As of 2002 many Japanese artists have started to take in this genre from the influence of UK DJ's.

The club and dance scenes worldwide have been using psychedelic trance in performances along with Goa trance, ambient trance, progressive trance, and minimalist trance. The mixture of Goa and psychedelic trance music is the popular kind of trance performance to many trance listeners. Psychedelic trance can be considered an offshoot of Goa trance. Popular artists that make psychedelic trance include Astral Projection, Space Tribe, Infected Mushroom, Atmos, Total Eclipse, Cosmosis and Simon Posford. Psychedelic trance is often played at outdoor festivals. People at these festivals sometimes consume psychedelic drugs like LSD, ecstasy and psychedelic mushrooms. The festivals often take place over a few days with music being played 24 hours a day.