This study aims to present an evaluation of 4th grade English course books, which are officially issued for, prescribed for and distributed free of charge in state primary schools by the Ministry of Education in Turkey and to point out how an ideal textbook for young learners should be. In the initial chapter, the general background of the study, purpose of the study, research questions, limitations of the study are introduced. Then, the characteristics of young learners are revealed in Chapter II. In addition, the definition of a textbook, its advantages, and disadvantages are presented. Besides, this chapter includes textbook evaluation schema and guideline for textbook evaluation. The next chapter gives information about Turkish Curriculum of foreign language for 4th grade students. The distinction between curriculum and syllabus is provided. In the fourth chapter, the course books that are currently utilized in state primary schools at 4th grade are evaluated with the criteria afore-mentioned in mind. These course books are titled Enjoy English 4, Time for English, Build up Your English 4 and Spring 4. In the last chapter, overall consensus of the study, evaluation of research questions and suggestions for the further studies are presented.