Schizophrenia is the most severe chronic disabling psychiatric disorder that needs long term care in various aspects. Therefore, the family's emotional atmosphere caused by the disease affects the condition of the patients' caregivers. This study aimed to investigate the effect of emotional regulation training on stress, anxiety, and depression in caregivers of patients with schizophrenia. The study was a randomized controlled trial. Seventy caregivers of patients with schizophrenia randomly assigned to a group that received emotion regulation training and a control group.