This study aims to describe the process of achieving self-actualization of the main character Libby Strout in the novel of Holding Up the Universe by Jennifer Niven. The method used in this research is descriptive qualitative with a literary psychology approach namely hierarchy of needs by Abraham Maslow. The data in this study were taken from the novel, such as dialogues, narratives, and monologues. The researcher used several steps of collecting the data, such as reading novel, identifying the data, classifying the data, and reducing the data. The process of Libby achieving self-actualization is carried out by meeting other needs, such as physiology, safety and security, love and belonging, self-esteem needs. The next was, Libby Strout satisfied the self-actualization need. She satisfied some of the self-actualization’s characteristics: acceptance (self and others), the quality of detachment: need for privacy, interpersonal relationship, naturalness in behaving, autonomous functioning, independence, freshness of appreciation, resistance to enculturation, and peak experience.