Objective This study sought to investigate the effects of yoga on the quality of life in patients with breast cancer. Design Twenty patients between 30 and 50 years of age presently under treatment for breast cancer were included in the study. The physical characteristics of the patients were recorded and general physiotherapy assessments performed. Eight sessions of a yoga program including warming and breathing exercises, asanas, relaxation in supine position, and meditation were applied to participants. Main outcome measures The pre- and post-yoga quality of life assessments for the patients were conducted using the Nottingham Health Profile (NHP). Patients' stress levels were assessed using the STAI-I and STAI-II anxiety inventory. Their satisfaction levels about the yoga program was evaluated using the visual analog scale (VAS). Results It was found that patients' quality of life scores after the yoga program were better than scores obtained before the yoga program (p < 0.05). After sessions, there was a statistically significant decrease in their STAI-I (measuring the reactions of anxiety) scores and STAI-II (measuring the permanence of anxiety) scores (p < 0.05). It was found out that the satisfaction score concerning the yoga program was considerably increased after the yoga program (p < 0.05). Conclusions It can be concluded that yoga is valuable in helping to achieve relaxation and diminish stress, helps cancer patients perform daily and routine activities, and increases the quality of life in cancer patients. This result was positively reflected in patients satisfaction with the yoga program.