Archery athletes train physically and technically to be able to make a full series of bow-pulls, but athletes who can make good movements during training may not be able to do it perfectly during matches. The athlete’s concentration can be disturbed by various things when competing and affect the athlete’s performance and achievement. The ability to concentrate is something that can be trained through mental training. This study aims to examine whether there is an effect of progressive muscle relaxation, as one method of mental training, on the concentration of archery athletes. This study uses an experimental method with a pretest-posttest control group design. The subjects of this study were 12 UNIMED Archery Club athletes who were divided into experimental and control groups. The instrument used to measure an athlete’s concentration is the Grid Concentration Exercise. Data obtained by doing pretest and posttest in both groups. The Progressive Muscle Relation Treatment was given only to the experimental group. Wilcoxon Test analysis results showed there were differences in concentration scores between after and before treatment in the experimental group, meaning that the hypothesis “there is an effect of progressive muscle relaxation on concentration in Archery athletes” was accepted. The experimental group had an average gain score higher than the control group, it showed that progressive muscle relaxation had an effect on increasing the concentration of Archery athletes.