Which title is often associated with the theme of existentialism?

The title that is most closely associated with the theme of existentialism is "The Stranger" by Albert Camus. This novel revolves around the protagonist Meursault, whose detached perspective on life exemplifies the absurdity and meaninglessness that are central tenets of existentialism. Camus explores concepts like the individual's confrontation with an indifferent universe, the search for meaning, and the nature of human existence through Meursault's experiences and actions, particularly in how he responds to social norms and the expectation of emotional engagement in significant life events.

The narrative illustrates the existential idea that life lacks inherent meaning, and it is the individual who must navigate their existence and ascribe their own meaning to it. Meursault's infamous indifference and the ensuing trial reflect the broader human condition, emphasizing themes of alienation and the absurd. This focus on the individual's experience and perspective make "The Stranger" a quintessential existentialist text.

Other titles may touch on existential themes, but they do not encapsulate the core principles of existentialism as distinctly as Camus's work does.