Catatonia is a severe psychiatric and medical condition, characterized by, in catatonic stupor, a general absence of motor activity, and, in catatonic excitement, violent, hyperactive behavior directed at oneself or others but with no visible purpose. Catatonia is associated with a number of other psychiatric and medical conditions, such as the life-threatening neuroleptic malignant syndrome as well as drug abuse, namely LSD, depression, and schizophrenia. Depending on the case, there are a variety of available treatments, including benzodiazipines.

A famous example of a catatonic person is departed Pink Floyd member, Syd Barrett.

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For the band of the same name, see Catatonia (band)