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.