The study aimed to analyze the content of the book “Arabic: My Language” for fourth grade in light of the characteristics of a good textbook, applicable in Jordanian schools for the academic year 2023–2024. The researchers employed the descriptive-analytical method. The study population consisted of the “Arabic: My Language” textbook for fourth grade. To achieve the study’s objectives, a content analysis form was constructed to measure the book’s conformity with the characteristics of a good textbook. The form’s validity and reliability were verified and applied to the study population. The results showed that the degree of suitability of the “Arabic: My Language” book for fourth-grade students, according to the overall characteristics of a good textbook, was very appropriate. The suitability percentages for each domain of good textbook characteristics were as follows: book design and layout (93.75%), book language (83.33%), language activities (81.22%), and general outcomes and linguistic content (75%). The results also indicated that the book’s description and analysis revealed its suitability for the age group in the following areas: general information, design, and presentation style. The study recommended focusing on linguistic content by linking the curriculum to the educational environment and conducting studies on other samples that include additional variables.