This study aims to evaluate the preparedness of South and North Korean high school English textbooks for global citizenship education by analyzing their content. For this purpose, a total of 30 high school textbooks from South Korea and three from North Korea were examined to determine the frequency and proportion of reading materials related to global citizenship education. The results showed that 33.3% of the reading materials in South Korean English textbooks were related to "understanding diverse cultures and perspectives," followed by "understanding an interdependent world" (28.3%), "understanding global conflicts and issues" (22.2%), and "responsibility and solidarity with the global community" (16.2%). On the other hand, "understanding of interdependent world" and "understanding of global conflict and issues" accounted for the largest portion of North Korean English textbooks with the same ratio (40% each). In particular, North Korean textbooks dealt with only the contents of "environmental issues" among the topics of "understanding of global conflicts and issues." Next, it was found that there were two cases of "understanding of diverse cultures and perspectives" (20.0%), but that "responsibility and solidarity with the global community" was not included in North Korean English textbooks at all. Consequently, both South and North Korean English curricula and textbooks include content related to global citizenship education, although there are differences in their frequency and distribution.