This quantitative dissertation examined the differences between young men and women's perceptions of mathematics and science identity, self-efficacy, and utility. There are gender norms and stereotypes that impact identity, self-efficacy, and perceived utility of mathematics and science. The secondary data analyzed were drawn from the follow-up High School Longitudinal Survey (HSLS:09). The survey was administered to 20,594 11th-grade students enrolled at 904 eligible public, charter, and private schools from all states and the District of Columbia. The study investigated whether there are gender-based statistically significant (p < 0.05) differences in 11th grade students' perceptions of mathematics and science identity, mathematics and science self-efficacy, and mathematics and science utility. The results of the study suggest that there are statistically significant differences between the genders in mathematics identity, science identity, mathematics self-efficacy, and science self-efficacy, but not statistically significant differences in mathematics utility and science utility. Continued research could prove useful to continue analyzing the gender gaps present. [The dissertation citations contained here are published with the permission of ProQuest LLC. Further reproduction is prohibited without permission. Copies of dissertations may be obtained by Telephone (800) 1-800-521-0600. Web page: http://www.proquest.com/en-US/products/dissertations/individuals.shtml.]