The present study investigated the psychometric properties of the Self-Talk Scale (STS) among Iranian university students. Six hundred eight university students completed the STS and one of six self- and cognitive-related measures. The results of exploratory factor analysis showed the same four factors (i.e., self-reinforcement, self-management, self-criticism, and social-assessment) in the STS-Iranian version. Item analysis and internal consistency coefficients demonstrated that the items and factors were satisfactory. Confirmatory factor analysis also supported a four-factor model. Self-talk frequency scores were associated with personality measures in theoretically meaningful ways. The results indicate that the STS is acceptable for measuring self-talk frequency among Iranian adults.