INTRODUCTION: Although psychological therapies are preferred by older adults, the utilization rate of these therapies is significantly low in older adults with depression. Understanding the barriers and facilitators to engaging in psychological therapies experienced by older adults is important for improving utilization rates. Aim: This review aimed to explore the barriers and facilitators to engaging in psychological therapies experienced by older adults with depression. Methods: A systematic review of qualitative studies on psychological therapy engagement among older adults with depression. Relevant published studies and grey literature were searched. The Critical Appraisal Skills Programme tool was used to assess the quality of the included studies. The results of the included studies were synthesized using thematic synthesis. Results: Personal suitability for therapy engagement, practical abilities, personal therapy preferences and familiarity with psychological therapies was associated with therapy engagement. Therapists' competencies also affected therapy engagement. Discussion: Older adult's personal health status and requirements for psychological therapy should be considered. Implications for practice: Mental health practitioners should consider whether specific psychological therapies are beneficial and acceptable for older adults. Improvements are needed in older adult's familiarity with psychological therapies and the ability of therapists to address the mental problems of older adults.