Error analysis is a type of linguistic analysis that focuses on the errors made by learners in using their second language. This study focuses on spelling errors in the data collected out of 78 written Persian essays produced by 32 adult Russian learners, who were in the intermediate level in Persian language. These errors were first detected and classified into 2 major categories and then divided into several subcategories. This paper further attempts to describe and diagnose errors in accordance with two major categories: interlingual errors and intralingual errors, and some sub-categories were also identified. It was found that the most frequent errors made by the intermediate level Russian students’ in their written productions in Persian language at result from the intralingual errors. Finally, some suggestions have been made for the treatment of the errors.

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