Background: Electroconvulsive therapy is one of the most effective and rapidly-acting treatments for many psychiatric conditions as major depression, schizophrenia, and bipolar disorder. The majority of psychiatric patients describe electroconvulsive therapy as a frightening treatment and they experience high level of anxiety before receiving it or when the decision to receive it is made. Aim: Is to determine the effect of progressive relaxation technique on the psychiatric patient's anxiety level before electroconvulsive therapy. Subjects and Method: A quasi-experimental design was used in this study that carried out at the inpatient units at Port Said Psychiatric Health Hospital. The subjects of the study compromised sixty psychiatric inpatients to whom electroconvulsive therapy were prescribed regardless of their diagnosis. They were divided into two equal groups (study and control) with thirty patients in each group. The study data were collected by using the Spielberger State Anxiety Inventory (STAI), in addition to personal and clinical data questionnaire. Results: The revealed that there are significant differences between controls and studied group of patients in relation to presence of someone who support patients socially and psychologically especially relatives during treatment at hospital. Most of control and studied group had mild anxiety after progressive relaxation technique. Finally, there were significant differences between before and after progressive relaxation in studied group. Recommendations: Progressive relaxation technique may be used as complementary treatment to decrease the hospitalized psychiatric patient's anxiety. The psychiatric nurse can easily apply this technique to manage patients' anxiety.