This study tested a causal model, based on social cognitive career theory (SCCT; R. W. Lent, S. D. Brown, & G. Hackett, 1994, 2000), of math and science career interests among 6th-grade adolescents (N = 318). Consistent with SCCT, it was found that career gender-typing, mother's and father's support for pursuing math and science careers, as well as the structure of the family itself (2-parent intact vs. single parent) predicted young adolescents' math self-efficacy; career gender-typing and mother's support predicted math outcome expectations; and math self-efficacy and outcome expectations predicted math and science career interests. Counselor recommendations based on these findings are included. (Contains 1 table and 1 figure.)