Kunstler is a German surname meaning "artist". Notable people with the surname include:
Emily Kunstler, activist and a documentary filmmaker
Franz Künstler, the last known surviving veteran of the First World War who fought for the Austro-Hungarian Empire
James Howard Kunstler (born 1948), American author
Karl Künstler (1901–1945), German Nazi concentration camp commandant
Mort Künstler (born 1931), American artist
William Kunstler (1919–1995), American lawyer and activist