Loneliness is a significant psychosocial concern for patients with cancer, and depression may be an antecedent to loneliness. To date, no studies have directly addressed the relationship of loneliness, depression, and social support among Turkish patients with cancer and their caregivers. The emotional responses that result from a cancer diagnosis vary and may include anxiety, anger, frustration, or depression. Because of the unexpected demands and emotions thrust on them, the caregivers of patients with cancer may be just as likely to experience loneliness or depression following a cancer diagnosis. As a result, this study sought to examine that relationship among a sample of 60 patients with cancer and 60 caregivers.