Equity in education refers to the accessibility of educational opportunities by the students from disadvantaged groups in the society as well as the other groups. Socio-economic status is evidently one of the most dominant factors defining advantaged and disadvantaged social groups. On the other hand, bilingualism may either be an educational advantage or a disadvantage in different conditions. This study is a causal-comparative survey aiming to investigate the relationship between bilingual students' self-efficacy toward Turkish speaking skills and the socio-economic status of their families. The study was conducted on 1763 bilingual students studying in middle schools located in several districts in Izmir where bilingual people commonly live. Participants' self-efficacy toward Turkish speaking skills was measured by Bilingual Students' Self-efficacy toward Turkish Speaking Skills Scale including 10 Likerttype items. Participants' socioeconomic status was measured by a series of items about their parents' educational and occupational status and family income. Data were analyzed by using Kruskal-Wallis ANOVA and the findings showed that there are significant differences in bilingual students' self-efficacy toward Turkish speaking skills between low and high socioeconomic status and between low and medium socioeconomic status.