The aim of this study is to develop a valid and reliable scale that can determine self-efficacy beliefs in foreign language learning. The study was conducted with 466 students studying English, German, French and Arabic in a university. The opinions of experts in the field have been consulted in order to ensure the appropriateness of the scale in terms of scope validity. Exploratory factor analysis (EFA) and confirmatory factor analysis (CFA) were applied for construct validity of the scale. As a result of the analysis, it has been determined that the scale consists of 25 items and has 3 sub-dimensional structure explaining 52.8% of the total variance. In order to verify the factor structure of the scale, CFA was performed and the goodness of fit values were calculated as ?2/df = 3,903, GFI = 0,841, TLI = 0,926, CFI = 0,934, RMSEA = 0,079 and SRMR = 0,0370. Cronbach's Alpha reliability coefficient were calculated 0,977 and the test-retest reliability coefficient (Pearson correlation) of the scale was calculated as .914 for the dimension of listening comprehension, for the dimension of written and verbal expression, as .896 and for the dimension of reading and understandig as .935. These values indicate that this scale is a valid and reliable scale. Thus, it is possible to conduct research on different groups with this scale which determining the self-efficacy belief in learning a particular language and education level is not restricted.
Keywords: Foreign Language Learning, Self-Efficacy Belief, Developing a Scale, Validity, Reliability