Hunger (Sult), published in 1890, is a groundbreaking novel by Norwegian author Knut Hamsun. It offers a profound exploration of a young writer's battle with poverty and starvation in late 19th-century Kristiania (now Oslo). This work is celebrated for its deep psychological insight and is considered a forerunner of modern literature.

The story centers on an unnamed protagonist, an aspiring writer who roams the streets of the city, enduring the physical and mental effects of extreme hunger. As his deprivation worsens, his grip on reality weakens, leading to erratic and self-destructive actions. Hamsun's portrayal captures the character's inner turmoil and the societal apathy that intensifies his suffering.

Drawing from his own experiences with destitution, Hamsun presents a character study that moves away from traditional plot structures, focusing instead on the visceral sensations and fragmented thoughts of the individual. This introspective approach marked a departure from the realist conventions of the time, influencing later literary movements and authors. Hamsun emphasized the importance of delving into the intricacies of human consciousness, reflecting his belief that literature should explore the depths of the mind.

Hunger has been translated into multiple languages and continues to resonate with readers for its raw depiction of human vulnerability and resilience. Its exploration of themes such as isolation, pride, and the relentless pursuit of artistic expression ensures its place as a cornerstone in the study of psychological literature.