Background: The quality of care that older adult patients receive during hospitalization is directly associated with the perception, knowledge, and skills of the healthcare team. This qualitative study was conducted to explore the concept of age discrimination perceived by hospitalized older adult patients. Methods: The present exploratory qualitative study was conducted using conventional content analysis. The purposive sampling method was used to recruit participants and the sampling continued until data saturation. A total of 21 individuals comprising of 12 hospitalized older adult patients, 5 family caregivers, 3 nurses, and a physician were enrolled in the study. Data were collected through 21 face-to-face, semi-structured, in-depth interviews. Data were analyzed using the qualitative content analysis method as described by Elo and Kyngäs. Results: The analysis of the interview data resulted in 4 main categories, namely injustice perceptions, interactional injustice, procedural injustice, and organizational injustice. Conclusion: The findings of the study indicated that older adult patients perceive the occurrence of age discrimination by healthcare teams and inequalities in the provided care in hospitals. It is therefore important to address ageism and subsequent inequalities through short and long-term policies and plans, as well as standardization and transformation of the present condition of hospitals to become an age-friendly environment.