The major aim of this study was to design and validate a Scale on English Language Teacher Perfectionism (SELTP). To this end, the scale was constructed by picking up the most common aspects of English language teachers’ perfectionistic orientations. Afterwards, the scale was administered to 407 EFL learners in private language institutes in Mashhad, Iran. Rasch measurement was utilized to substantiate the construct validity of the scale. The results of the Rasch analysis exhibited that all of the items met the criteria for fit to the Rasch model and therefore the whole scale can be considered as unidimensional. Finally, statistical results were discussed, and implications were provided in the context of English language teaching.

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