A hospital admission presents various challenges for a patient which often result in high or intense spiritual needs. To provide the best possible care for older adults during hospitalization, it is essential to assess patients’ spiritual needs. However, little research has been done into the spiritual needs of geriatric patients. This article seeks insight into what is known in the literature on the spiritual needs of geriatric patients. This integrative review presents a summary of the articles on this topic. To select eligible studies, the PRISMA Flow Diagram was used. This resulted in ten articles that have been reviewed. Results show (1) a wide interest in researching spiritual needs, using different research designs. In addition, (2) four subcategories of spiritual needs can be distinguished: (a) the need to be connected with others or with God/the transcendent/the divine, (b) religious needs, (c) the need to find meaning in life, and (d) the need to maintain one’s identity. Moreover, results show that (3) assessing spiritual needs is required to provide the best possible spiritual care, and that (4) there are four reasons for unmet spiritual needs. Further research is needed on the definition of spiritual needs and to investigate older patients’ spiritual needs and the relation with their well-being, mental health and religious coping mechanisms, in order to provide the best spiritual care.