The term Viennese Actionism describes a short and violent movement in 20th century art that can be regarded as part of the many independent efforts of the 1960s to develop "action art" (Fluxus, Happening, Performance, Body Art, etc.). Its main participants were Günter Brus, Otto Mühl, Hermann Nitsch and Rudolf Schwarzkogler. As "actionists", they were active between 1960 and 1971. Most have continued their artistic work independently from the early 1970s onwards.
Documentation of the work of these four artists suggests that there was no consciously developed sense of a movement or any cultivation of membership status in a "actionist" group. Rather, this name was one applied to various collaborative configurations among these four artists. Malcolm Green has quoted Hermann Nitsch's comment, "Vienna Actionism never was a group. A number of artists reacted to particular situations that they all encountered, within a particular time period, and with similar means and results."