Pioneer in child psychoanalysis theory.

Fashion brand known for minimalism.

French artist, pioneer of Nouveau Réalisme.

Mathematician known for Klein bottle.

(born May 8, 1970) a Canadian author, social activist, and filmmaker known for her political analyses; support of ecofeminism, organized labour, and criticism of corporate globalization, fascism and capitalism.

Non-orientable, boundaryless, single-surface bottle.

(born September 7, 1946) an American political commentator and author.

(born Hannah Golofsky; August 3, 1923 – March 19, 1974) an American fashion designer, businesswoman, as well as a founder and the namesake of Anne Klein & Company (owned by WHP Global as of July 2019).

(born February 8, 1942) an American stand-up comedian, singer, and actor.

Michael "Mișa" Klein (10 October 1959 – 2 February 1993) was a Romanian footballer who played as a left-back.

(April 19, 1926 – September 10, 2022) an American-born French photographer and filmmaker noted for his ironic approach to both media and his extensive use of unusual photographic techniques in the context of photojournalism and fashion photography.

(January 7, 1867 – May 7, 1915) an English-born playwright and actor who emigrated to America in 1883.

Paul Robert Klein was an American art dealer.

Joel Irwin Klein (born October 25, 1946) is an American lawyer and school superintendent.

Fred "Fritz" Klein (December 27, 1932 – May 24, 2006) was an Austrian-born American psychiatrist and sex researcher who studied bisexuals and their relationships.