Thanks to technology and fast changes in social life, the content of textbooks should be evaluated regularly to be compatible and adapted with the daily needs of learners, and applying a checklist is a common approach to textbook evaluation. This study attempts to present a valid, reliable, and practical checklist for evaluating Persian and English textbooks. For this purpose, more than 40 Persian and English checklists were studied, and a new five-point Likert checklist was created based on these checklists, some of these questions are the common ones in these checklists, some are specific to these checklists, and some new items were added by the authors and finally a new checklist with 95 questions in 4 main categories of physical features, design and lay out; skills and sub-skills; subject and content; practical consideration was created. Some English and Persian instructors and professors viewed the checklist to verify its content validity and after some correction, 83 English and Persian language teachers and instructors answered the items. They were free to add or rectify items if needed, as well as to give their opinion. The data was entered into the R software and was analyzed, as a result, some questions were deleted, as their factor load was below 0/5. All remained constituents were considered valid and reliable because their AVE was above 0/4 and their CR was between 0/5 and 1, and Cronbach\\\'s Alpha was more than 0/7. This new validated checklist could be useful for Persian and English language teachers and instructors, PLT (Persian language teaching) and ELT material developers, plus curriculum developers.

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