This study applied the content analysis method to compare the differences in the geometry problems, problem-posing methods, representational types, and characteristics of geometry content of middle school mathematics textbooks among Kang Hsuan (KH) in Taiwan, Connected Mathematics Program (CMP) in the United States, and New Syllabus Mathematics (NSM) in Singapore. The results reveal significant differences in the total geometry problems and problem-posing methods among the three textbooks. The CMP included approximately one-third open-ended problems; however, the KH and NSM textbooks included more than 95% closed-ended problems. Regarding representation types, all three textbooks presented combined problems and verbal problems. In addition, the results show that the three textbooks have different characteristics. The findings of this study can serve as a reference for designing mathematics textbooks in the future.