Ecstasy (from Ancient Greek ἔκστασις (ékstasis) 'outside of oneself') is a subjective experience of total involvement of the subject with an object of their awareness. In classical Greek literature, it refers to removal of the mind or body "from its normal place of function."

Total involvement with an object of interest is not an ordinary experience. Ecstasy is an example of an altered state of consciousness characterized by diminished awareness of other objects or the total lack of the awareness of surroundings and everything around the object. The word is also used to refer to any heightened state of consciousness or intensely pleasant experience. It is also used more specifically to denote states of awareness of non-ordinary mental spaces, which may be perceived as spiritual (the latter type of ecstasy often takes the form of religious ecstasy).