In many developed countries, including Canada, it is often perceived that gender issues in mathematics have been "solved" and are no longer a relevant and timely issue. In this article, I challenge this perception by providing an overview of gender issues in mathematics in three domains-achievement, attitude, and participation-from the elementary school level to the university level. My analysis of several sources of data from Ontario is compared to a meta-analysis of research involving data from culturally similar countries to Canada, for example, Australia, United Kingdom. The data primarily arise from large-scale mathematics assessments, for example, PISA and EQAO, and national statistics databases, for example, Statistics Canada and National Center for Education Statistics. Counter to the aforementioned perception, this analysis indicates that gender issues still exist in mathematics in developed countries, including Canada. The gender gap is particularly wide in terms of students' attitudes and participation: Males have substantially more positive attitudes toward mathematics and higher levels of participation in non-mandatory levels of mathematics than do females. The article concludes with a discussion of the implications of the findings and suggestions of possible steps that may be taken to help ameliorate the current situation.Gender issues have long been a heated topic of debate in mathematics education. Early research (e.g., Fruchter, 1954;Stafford, 1972) tended to focus on biological explanations for perceived differences between males and females in spatial perception and mathematical reasoning ability. However, other researchers questioned the biological focus and examined other issues that might affect students' experiences with mathematics. In the late 1970s, a seminal study of U.S. high school students by Fennema and Sherman (1977) marked a turning point in the focus of mathematics education research about gender issues. Fennema and Sherman found that when two factors, the number of prior mathematics courses taken and experience with spatial activities, were controlled, no statistically significant gender differences in spatial abilities existed. The researchers also investigated students' attitudes toward mathematics, and found that males generally had more positive attitudes than females toward the subject area. Based on their findings, Fennema and Sherman posited that students' attitudes were socially constructed as opposed to biologically determined. Since this study, research regarding gender issues in mathematics education has generally moved away from biologically deterministic arguments.Gender Issues in Mathematics: An Ontario Perspective 60In the 1990s, in particular, there was a great deal of research that focused on gender issues in mathematics, investigating how social factors, including parents' views and the manner in which mathematics is taught, may impact female and male students' attitudes, achievements, and participation in mathematics in different ways (e.g., Boaler, 1...