Using quantile regression analyses, this study examines gender gaps in mathematics, science, and reading in Azerbaijan, Indonesia, Jordan, the Kyrgyz Republic, Qatar, Tunisia, and Turkey among 15 year-old students. The analyses show that girls in Azerbaijan achieve as well as boys in mathematics and science and overachieve in reading. In Jordan, girls achieve as well as boys in all subjects. In Qatar and Turkey, girls underachieve in mathematics, achieve as well as boys in science and overachieve in reading. In Indonesia, the Kyrgyz Republic, and Tunisia, girls underachieve in mathematics and science but overachieve in reading. On the basis of the analyses, two generalizations can be made. First, key country-level economic and social characteristics appear unrelated to achievement gender gaps. Second, the overachievement of girls in reading and underachievement in mathematics and science are similar to findings from non-Muslim industrialized countries. (Contains 5 tables and 6 footnotes.) [This study was supported by a Proffitt Research Grant from Indiana University.]