"The Man Without Qualities" (originally "Der Mann ohne Eigenschaften") is an unfinished novel by Austrian writer Robert Musil, published in two parts between 1930 and 1933. Considered one of the most important works of 20th-century literature, the narrative explores themes such as identity, morality, reason, and the human condition in a context of social and cultural transition.

The story revolves around Ulrich, a man of superior intelligence and aimless life, who finds himself in a crisis of identity and seeks meaning in his existence. Ulrich is a "man without qualities," meaning he does not fit into any of the prevailing social or ideological molds in early 20th-century Vienna. The novel presents a diverse cast of characters, each representing different aspects of the society of the time, such as love, power, politics, and art.

Musil employs a rich and philosophical prose, interspersing dialogues, reflections, and a biting critique of contemporary society. The book does not follow a linear narrative but instead has a fragmented structure, reflecting the complexity of life and the uncertainties of the modern world.

"The Man Without Qualities" is also a critique of rationalism and empiricism, questioning the ability of human reason to comprehend life. The work is notable for its psychological depth and its approach to the search for meaning in a changing world, making it an essential reference for literature and philosophy in the 20th century.