Art criticism is the discussion or evaluation of visual art.

Art critics usually criticize art in the context of aesthetics or the theory of beauty. One of criticism's goals is the pursuit of a rational basis for art appreciation.

The variety of artistic movements has resulted in a division of art criticism into different disciplines, each using vastly different criteria for their judgements. The most common division in the field of criticism is between historical criticism and evaluation, a form of art history, and contemporary criticism of work by living artists.

Despite perceptions that art criticism is a much lower risk activity than making art, opinions of current art are always liable to drastic corrections with the passage of time. Critics of the past are often ridiculed for either favoring artists now derided (like the academic painters of the late 19th Century) or dismissing artists now venerated (like the early work of the Impressionists). Some art movements themselves were named disparagingly by critics, with the name later adopted as a sort of badge of honor by the artists of the style (e.g. Impressionism, Cubism), the original negative meaning forgotten.

Nocturne in Black and Gold: The Falling Rocket (1874) by James McNeill Whistler

Some critics are unable to adapt to new movements in art and allow their opinions to override their objectivity, resulting in inappropriately dated critique. John Ruskin famously compared one of James McNeill Whistler's paintings, Nocturne in Black and Gold: The Falling Rocket, to "flinging a pot of paint in the public's face".

Artists have often had an uneasy relationship with their critics. Artists usually need positive opinions from critics for their work to be viewed and purchased; unfortunately for the artists, only later generations may understand it.