Objectives and method: The Multidimensional Inventory of Perfectionism in Sport (MIPS; Stoeber, Otto, & Stoll, 2006) is a commonly used measure of perfectionism in sport. However, there is limited empirical evidence supporting its subscale structure and composition. Therefore, the present study investigated the factor structure of the MIPS in a sample of 470 athletes (mean age 20.0 years). Results: Confirmatory factor analysis showed that the data supported the hypothesized four-factor structure of the MIPS, differentiating: striving for perfection, negative reactions to imperfection, parental pressure to be perfect, and coach pressure to be perfect. Conclusions: The findings suggest that the MIPS has acceptable factorial validity and therefore may be a useful measure to explore individual differences in perfectionism in sport. (C) 2016 Elsevier Ltd. All rights reserved.