The aim of this study was to examine English as a Foreign Language (EFL) students' perceived levels of self-efficacy and self-determination. The participants of the study were 378 university students studying in the English preparatory program of a state university in Turkey. As data collection instruments, two scales were utilized (i.e., Self-Efficacy Scale and Self-Determination Scale). The data were analyzed through Statistical Package for the Social Sciences (SPSS) using the arithmetic mean, Mann-Whitney U and Spearman's Rank Correlation Coefficient tests. It was found that the students' total self-efficacy and self-determination levels were average. Additionally, the data yielded the conclusion that there is a significant difference between the students' English academic achievement levels and their perceived self-efficacy levels in all four basic language skills. It is also concluded that there is a significant correlation between all dimensions of self-efficacy and those of self-determination scales. These findings were discussed in line with the relevant literature.