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To examine the relationship between perfectionism and sport achievement in a sample of athletes, 74 students (44 males, 30 females) from Faculty of Physical Education and Sport Sciences, University of Tehran, participanted in this study. All participants were asked to complete Farsi version of Positive and Negative perfectionism Scale (FPANPS). To measure the sport achievement, athletes’ coaches were asked to rate Sport Achevement Scale (SAS). Analysis of the data involved both descriptive and inferential statistics including means, standard deviations, analysis of variance, Pearson’s correlation, and regression analysis. A simple positive and negative correlation was found between positive and negative perfectionism and sport achievement respectively. However, positive perfectinism was the only significant predicting factor for changes in sport achievement. Positive perfectionism is supposed to increase the level of sport achievement via characteristics such as realistic thinking, acceptance of personal limitations, flexibility, self-satisfaction, enhancement of self-esteem, self-confidence, as well as positive perception of social supports and evaluations.