Relaxation therapy refers to a number of techniques designed to teach someone to be able to relax voluntarily. These techniques can include special breathing practices and progressive muscle relaxation exercises, which are designed to reduce physical and mental tension. There are a number of other activities that can promote relaxation, including massage, listening to music, yoga and meditation.

Muscle tension is usually associated with stress and anxiety, which are strongly associated with depression. Becoming aware of the link between depressive thoughts and mental and muscle tension, and learning to voluntarily let go of this tension, may help to reduce depression symptoms. There have been a number of randomised controlled trials on the effect of relaxation therapy for people with depression. In general, these studies have found that relaxation therapy works better than no treatment, but not as well as psychological treatments such as cognitive behaviour therapy. The longer-term effects of relaxation therapy are uncertain.