• Antoine Roquentin – The protagonist of the novel, Antoine is a former adventurer living alone in Bouville for three years. He has no friends and is out of touch with family, and often resigns himself to eavesdropping on other people's conversations and examining their actions from a distance. He settles in the seaport town of Bouville to finish his research on the life of an 18th-century political figure, but during the winter of 1932 a "sweetish sickness," as he calls nausea, increasingly impinges on almost everything he does or enjoys. He attempts to find solace in the presence of others, but exhibits signs of boredom and lack of interest when interacting with them. Because of his aloofness to the world and the people around him, he eventually starts to doubt his own existence.The character is based on existentialism Philosophy.
  • Anny – An English woman who was once Antoine's lover. After Antoine arranges to meet with her hoping it will ameliorate his condition, Anny makes it clear to him that she has changed a considerable amount and must get on with her life.
  • Ogier P. – Generally referred to as "the self-taught man" or the Autodidact, he is a bailiff's clerk and an acquaintance of Antoine's. Ogier lives for the pursuit of knowledge and love of humanity, which inspires in Antoine much criticism and mockery, although he develops a strange compassion for him. Highly disciplined, he has spent hundreds of hours reading at the local library. He often speaks to Antoine and confides to him that he is a socialist.

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