Physical exercise has shown the potential to reduce stereotypic behaviors. The current investigation conducted three meta-analyses on the effects of physical exercise on stereotypic behaviors in individuals with autism. Study 1 produced four aggregate score studies (n = 54) that included nine effect sizes ranging from d = -0.85 to 0.31. Study 1 yielded an overall effect size of d = -0.463. Study 2 produced six single subject design studies (n = 13) that included 48 effect sizes ranging from d = -1 to 0.5156. Study 2 yielded an overall effect size of d = -0.456. Study 3 combined all 10 studies (n = 67) that included effect sizes ranging from d = -1 to 0.5156. The n = 10 articles combined produced an overall effect size of d = -0.456. The effect sizes demonstrate that physical exercise does have the potential to decrease stereotypic behaviors in individuals with autism.