Textbooks have a fundamental role in English Language Teaching (ELT) classes; they can provide valid, valuable, and self-regulated sources for both learners and teachers. ELT textbook evaluation is essential for language learning and teaching. Accordingly, evaluating and assessing textbooks has a crucial role in confirming if they satisfy the needs of students, teachers, administrators, textbook publishers, and curriculum developers. In this regard, this article elaborates on textbook evaluation, then briefly overviews the various approaches toward evaluating ELT textbooks and material from the perspective of McDonough et al. (2013), Richards (2014), and Tomlinson (2013). Additionally, this article introduces criteria for material evaluation and it demonstrates how criteria can be established for evaluating English language textbooks.