The aims of this study were to examine the factor structure of the attitudinal questionnaire items from Trends in International Mathematics and Science Study (TIMSS) 2003 and to investigate low- and high-performing students' mathematics self-concept in East Asian societies and in the USA. The participants were 24,119 eighth-graders, 4856 from Japan, 4972 from Hong Kong, 5379 from Taiwan and 8912 from the USA. Exploratory factor analyses (EFAs) were conducted revealing a same factor structure across the four societies. The MANOVA results showed that (1) the US students reported a statistically significant higher mathematics self-concept than students in Hong Kong, Taiwan, or Japan; (2) across the four societies, high-performing students had statistically significant higher self-concept than low-performing students; and (3) the US low-performing students' self-concept was higher than Japanese high-performing students' self-concept. The implications of these findings are discussed. (Contains 8 tables.)